November 2025 Newsletter Recap: Industrial & Mega Project Problems Solved with DM ‘35’ & ‘45’

Posted on November 5, 2025 by Ductmate Industries

When heavy-duty ductwork requires heavy-duty connections, the Ductmate ‘35’ and ‘45’ self-sealing rectangular flange duct connector systems provide a better solution to your industrial and mega project problems. Learn more below.

Industrial & Mega Project Problems Solved with DM ‘35’ & ‘45’ Systems

You can forget about struggling with traditional, labor-intensive methods for connecting heavy-duty ductwork. Backed by rigorous testing and our industry-leading guarantee, this superior solution not only saves you time, money, and effort but also ensures exceptional performance, making your operations more efficient and cost-effective.

The innovative DM ‘35’ and ‘45’ systems are designed for applications where strong, leak-free connections are critical. Ideal for data centers, semiconductor plants, battery plants, wastewater treatment plants, chemical plants, oil rigs, stadiums and arenas, underground transit stations, and more.

The system features precision-engineered components for seamless assembly:

Roll-formed Flanges with Integral Mastic: Ensure a tight seal against the duct wall for a superior, leak-free connection. Integrated mastic eliminates the need for separate sealant applications, saving time and labor during assembly.
Corners: Reinforce the ductwork structure to hold everything together securely and provide a dedicated sealing surface for the gasket, further optimizing the system’s airtight integrity.
Gasket: Forms a vital barrier between the flanges to prevent air leaks and ensures optimal airflow within the duct system.
Cleats (Versa-Cleat or Bolt-On): Guarantee consistent compression and secure, efficient assembly, even on large duct spans.

With DM ‘35’ equal in strength to a SMACNA J-class and DM ‘45’ equal to a SMACNA K-class transverse joints, these systems provide the strength you need to connect the biggest duct imaginable without the labor-intensive fabrication processes of drilling bolt holes, welding frames, or applying rust-proof coatings. It’s no wonder that the DM ’35’ and ’45’ systems have become the clear choice over the labor-intensive companion angle.

Available in seven alloys (galvanized, galvanneal, aluminum (except cleat), aluminized, 304 stainless, 316 stainless, PVC-coated, and black iron), and with a variety of snap-on or bolt-on cleat, corner options, and more, the DM ‘35’ and ‘45’ systems are the ideal solution for your industrial and mega project problems.

RELATED PRODUCTS:

Time-Saving Tools

Did you know that we offer a variety of time-saving tools to make connections easier? For ordering information or additional details on our time-saving tools listed below, visit our catalog or contact Customer Service.

Repeater4200 Fastener Gun

The Repeater4200 is the quickest flange fastener in the industry, and is ideal for DM ‘25’/’35’/’45’, Spiralmate & Ventmate, and ECONOflange connector systems. This lightweight (10.5lbs), safe, and easy-to-use pneumatic fastener tool features an anti-double fire mechanism and a shock-absorbing comfort rubber handle. It packs a serious punch and is able to drive fasteners through various specialty metals with ease. Once you try it, you’ll wonder what you ever did without it.

Ductmate System Alignment Grip Tool

The Ductmate System Alignment Grip Tool is a modified vice grip designed to reduce on-site installation time for rectangular duct connections. Using the holes in the system’s corners, this tool quickly aligns and compresses mating ductwork, allowing for fast and easy installation.

Cleater Tools

The Cleater® 1 is the ideal tool for attaching metal or PVC cleat to flange joints when spacing is not an issue. For hard-to-reach places, use the Cleater 2 tool with a 5/8” deep-wall socket, extensions, and a wrench to attach the cleat.

The Versa Cleater is the ideal, versatile tool to attach Versa-Cleat® to the joints of DM ‘35’ and ‘45’ Systems, TDC connections, and some TDF profiles when space is not a consideration.

Similarly, the Snapper is the ideal tool for attaching cleat to the WDCI Flange, or TDC/TDF cleat to the flange profile.

Rapidmate Slide-On Flange Corners

The Rapidmate Corner lineup is the most advanced design, labor-saving corner system in the industry, with features that save time and money in both the shop and the field. This corner and fastener system provides an alternative method of efficiently assembling, aligning, connecting, and securing commercial rectangular duct systems.

In addition to their more common TDC/TDF profiles, Rapidmate Corners are also available for the DM35 and WDCI J slide-on flange systems. The DM35 Rapidmate 3A corner features a downset design to ensure a superior seal at the duct and corner, and an embossed pillow design for enhanced corner strength and fit. The DM35 12-gauge heavy corners and WDCI J 11-gauge corners have been designed for added strength.

Isolation Hanger Type SI

The Isolation Hanger Type SI is a sturdy, vibration-isolating steel hanging bracket featuring a rubber isolation pad, designed for use with threaded rods to suspend ductwork and other equipment, isolating vibration at its source.

Capable of supporting up to 1100 lbs (499 kg), the sturdy tension brackets have a much greater load-bearing capacity than the corresponding threaded rods. Its styrene-butadiene rubber padding isolates vibration at its source, preventing distracting noise transmission and extending the lifespan of HVAC equipment by reducing wear and tear. The outside dimensions match standard wrench sizes, so no special tools are required, making installation easy. The open space of the bracket corresponds to the width of the nut, preventing it from turning.

INDUSTRY NEWS & MORE:

Ductmate Value-Added Services

Ductmate offers a variety of value-added services and resources, including a rectangular duct construction standards guide, specialized product assistance and support, engineering assistance and product specification review, custom cut-to-length services, hands-on training, and online resources. We encourage you to take advantage of these value-added services and resources available to you to make your next job as simple as possible!

Want to learn more? Click here to read the full article.

Gasketing 101: A Guide to Sealing Ductmate Rectangular Flange Connector Systems

Without proper gasketing, improperly sealed ductwork can leak up to 30% of air, resulting in waste and forcing the system to work harder. Over time, this can lead to system failure and costly repairs. Prioritizing proper gasket application is not only best practice but also crucial for maximizing energy efficiency, extending system lifespan, and meeting building codes and standards.

Looking to learn gasketing best practices? Click here to read the full article.

Removable & Breakaway Fastener Connections Available for Rectangular Flange Systems

Ductmate offers removable and breakaway connections for rectangular flange connection systems.

Interested? Click here to learn more.

BIM Models

Did you know we offer BIM models for some of our most popular products to enhance and streamline building planning, design, and construction?

Click here to request access now.

PRODUCT UPDATES:

Florida Product Number Now Available for Hurricane Air Brace

Hurricane Air Brace now has its own Florida Product Approval Number (FL#47567)!

The Hurricane Air Brace is a direct-mount hanging bracket to support condenser units, heat pumps, and other HVAC equipment, particularly useful in residential or multi-family dwelling applications where flooding, snowfall, mud, and steep grades are a concern.

Approved for use in high-velocity hurricane zones, this direct-mount hanging bracket meets Florida’s high safety and quality standards, providing you with peace of mind whether you’re in a coastal area or simply preparing for severe weather.

Ready to Buy?

Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

Sign up for Ductmate’s e-Newsletter

Don’t miss our monthly e-newsletter! Click here and sign up to receive exclusive Ductmate news and announcements, product information, promotions, industry news, and more, right in your inbox.

Take Advantage of Ductmate’s Value-Added Services & Resources

Posted on October 31, 2025 by Ductmate Industries

We encourage you to take advantage of our variety of value-added services and resources available to you to make your next job as simple as possible! Learn more below.

Rectangular Duct Construction Standards

We provide a comprehensive Rectangular Duct Construction Standards guide for the proper design and assembly of rectangular ductwork utilizing the DM ‘25’/’35’/’45’ rectangular flange connector systems. These standards detail the systems’ components and provide tables for duct reinforcement and fastening requirements based on duct size and static pressure class in accordance with SMACNA standards.

This guide is essential for engineers, architects, and contractors to ensure that assembled duct connections are rigid, virtually leak-free, and meet specific industry performance criteria for both positive and negative-pressure applications.

You can access the guide at any time in the Technical Resources section of our website. Still have questions? We are also available to consult or assist with any duct system design questions you may have via phone or email.

Specialized Product Assistance & Support

We understand that some of our product lines are technical, even for seasoned HVAC Pros. That’s why we have Product Line Managers (PLMs) available to answer questions about the details of each of our products. Each PLM is assigned a specific Ductmate product line family, allowing them to provide expert assistance on their specific products.

Answers to your questions or problems as they occur are only a phone call away. Our engineering and technical assistance department will back up their information with test results and technical data to solidify your position as the on-site HVAC expert. Whenever you have a difficult or critical HVAC project, we can provide the technical assistance that gives you a strong competitive edge when you’re bidding, fabricating, and installing.

For those unusual, challenging, or downright difficult projects, Ductmate’s trained specialists can back up your personnel in several key areas. We are committed to providing you with the quality and service you expect and deserve when using any Ductmate product.

Engineering Assistance & Product Specification Review

Our experts are available to work with you to design and engineer the best possible solution to difficult or unusual systems. Whether you’re dealing with high winds, snow loads, excessive pressures, specialty alloys, or critical air systems, we’ve dealt with virtually every difficult and unusual duct application you may encounter.

We also offer detailed project specification review services. Please send your general specifications to orders@ductmate.com. Our experts will review the information and recommend a comprehensive solution for your project. We can compare your specs with current industry standards and suggest beneficial upgrades.

Custom Cut-to-Length Services

Custom cut-to-length services are available on Ductmate flange systems over 50”, as well as Standing S, Slips, and Drives. This simple solution is not only convenient but will also save you time and money in the long run by reducing labor time and scrap.

Additional lead times and charges may apply. Consult Customer Service for more information.

Hands-On Training

Our experts are available to provide comprehensive, hands-on product training at your shop or job site upon request. Whether you’re new to the HVAC industry or a seasoned professional looking for a refresher on our products, anyone can benefit from a training session.

Additionally, specialized Distributor Training Classes are offered periodically throughout the year at our Pennsylvania facilities to help our distributors succeed. During this three-day experience, you will spend time with our Ductmate Sales team and PLMs to learn all the features, benefits, technical aspects, and selling techniques of our products in a relaxed classroom atmosphere, gain valuable hands-on experience and learn directly from our experts on how our products work in the field, and see our facilities and get a first-hand look at how our products are manufactured. Class dates are posted at the beginning of each year, and spots are reserved on a first-come, first-served basis. Hotel accommodations, transportation to and from our facilities, and dining are all provided at no cost to you.

Online Resources

All Ductmate products are backed by detailed specification sheets, with most including installation instructions. To save you time finding the specs you need on our website, you can browse our product spec sheets in the Technical Resources section, or visit the product pages directly and scroll down to the Related Resources section.

We also offer detailed assembly and installation videos and manuals to help ensure the system is installed correctly from the start. Find everything you need—right on our website.

Removable & Breakaway Connections Available for Rectangular Flange Connection Systems

Posted on October 31, 2025 by Ductmate Industries

Ductmate offers removable and breakaway connections for rectangular flange connection systems. Learn more below.

Removable Connections

Removable fasteners provide quick, easy access for maintenance, inspections, and repairs. They are also used for temporary assembly during fabrication and for systems that may need reconfiguration.

Our removable connections feature carriage bolts and nuts, or hand-tightened wing nuts.

Breakaway Connections

Breakaway connections are safety devices that allow ductwork to detach from a fire damper sleeve during a fire, which keeps the damper securely in place within the fire-rated opening. The breakaway connection is designed to fail under this force before the entire damper is pulled out of the fire-rated opening. This maintains the fire barrier’s integrity, preventing the spread of flames, smoke, and heat through the opening.

Our breakaway connections feature nylon bolts and nylon nuts, or hand-tightened wing nuts.

Installation Instructions

IMPORTANT: During fabrication, do not notch duct sections or sleeves when using the Ductmate Rectangular Flange System. Refer to the assembly and installation manual for complete details.

Cut flange to the proper length for each respective profile.
Assemble each frame by inserting corner pieces into the hollow web of the flange.
Slide completed frames onto each duct section and sleeve, making sure that the assembly is thoroughly seated into the integral mastic pocket of the flange.
Apply a small amount of water-based duct sealant to the inside edge of each corner at the corresponding raw edge of the duct or sleeve.
Apply a continuous strip of closed-cell neoprene gasket to the entire face of one of the frames, making sure that the gasket covers the inside edge of each corner and the corresponding raw edge of the duct or sleeve.
Align the opposing frame and duct section to be connected and insert a carriage bolt into all four corners and firmly tighten. For applications requiring toolless access, use wing nuts instead of standard nuts (see fastener requirements below).
Apply 6” metal or PVC cleat according to the following schedule:

For ½”-2” WG/SP, use 6” cleat 24” OC
For 3-4” WG/SP, use 6” cleat 18” OC
For 6-10” WG/SP, use 6” cleat 12” OC

IMPORTANT: For breakaway connections, use only PVC cleat with a minimum of one per side

Fastener Requirements

Removable Connection Fasteners

Use metal or PVC fasteners:

DM ’25’ Systems: 1” x 5/16” carriage bolts and nuts or wingnuts
DM ‘35’ Systems: 1” x 3/8” carriage bolts and nuts or wingnuts
DM ‘45’ Systems: 1” x 1/2” carriage bolts and nuts or wingnuts

Breakaway Connection Fasteners

Use only nylon bolts and nylon nuts or wingnuts:

DM ‘25’ Systems: 1” x 5/16” nylon bolts and nuts or wingnuts
DM ‘35’ Systems: 1” x 3/8” nylon bolts and nuts or wingnuts
DM ‘45’ Systems: 1” x 1/2” nylon bolts and nuts or wingnuts

Ready to Buy?

Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

Gasketing 101: A Guide to Sealing Ductmate Rectangular Flange Connector Systems

Posted on October 31, 2025 by Ductmate Industries

Gasketing is an essential measure used to create tight, durable seals between joint surfaces. In HVAC systems, this directly combats the invisible thief: air leakage. Without proper gasketing, improperly sealed ductwork can leak up to 30% of air, resulting in waste and forcing the system to work harder. Over time, this can lead to system failure and costly repairs.

Prioritizing proper gasket application is not only best practice but also crucial for maximizing energy efficiency, extending system lifespan, and meeting building codes and standards.

What Gasket Options Does Ductmate Offer?

DM 440 Butyl Gasket Tape & Patches

DM 440™ Butyl Gasket Tape is the preferred gasket for the Ductmate ‘25’/’35’/’45’® flange connector systems. This tape has the widest range of application temperatures of any material on the market, ensuring a positive seal and ease of application under extreme conditions and is also suitable for use with other rectangular flange systems that require a gasket. It is LEED-compliant, USDA-acceptable, and meets FDA requirements, and is formulated with an EPA-registered biocide package that prevents the growth of mold, mildew, and fungus.

For the ‘25’ and ‘35’ systems, we suggest using a 5/8” wide 440 gasket, while a 1” wide gasket is recommended for the ‘45’ system. Optional 3” x 2” 440 corner patches are also available to help eliminate inconsistent or recurring gasketing problems at the corners.

Neoprene Gasket Tape

Neoprene Gasket Tape is a synthetic, closed-cell, and rubber-based duct sealing tape ideal for ensuring a firm, reliable, and long-lasting airtight seal in ductwork.

Its pressure-sensitive adhesive backing makes installation quick and easy. The durability of neoprene foam makes it easy to remove from ductwork without leaving a sticky residue or falling apart. This makes disassembling ducts for periodic cleaning or maintenance easier, allowing for quick, straightforward application of new tape to reseal the connection.

For applications using the DM ‘45’ system, a 1” wide neoprene gasket is required, while a 5/8” wide gasket is used for the ‘25’ and ‘35’ systems.

Sticky Tape

Specifically formulated for use in TDC & TDF roll-formed flange systems, our Sticky Tape is a high-quality general-use tape developed for the industry as a sealant, moisture, and dust barrier. It is non-hardening and has excellent adhesion to most dry metal surfaces.

Installing Gasket During Assembly

Rectangular Slide-On Flange Systems Standard Practices

When applying a gasket to slide-on flange connector systems, start by applying it halfway between the duct corners, then center it on the angle.

As you approach the duct corner, position the gasket in an arc to cover the three critical points. Please note that some gasket will protrude into the airstream.

Press the gasket firmly into contact with the raw edge of the duct corner and the Ductmate corner assembly. Apply the gasket completely around the Ductmate frame to the beginning point. Where the gasket meets, overlap it for approximately 3/8”.

On the opposing frame, apply 440 gaskets only to the corners, approximately 3” per corner, and make sure to cover the same three critical points as before. Alternatively, the DM 440 corner patches can help eliminate inconsistent or recurring gasketing problems at the corners during this step.

Carefully align mating frames before they touch, as DM 440 adheres on contact. A drift pin can be used to correct any misalignment.

Removable or Breakaway Connections

Begin by wiping the face of the flanges and corners with a dry cloth where the gasket and sealant will be applied.

Apply a water-based sealant to all eight corners of the connection, ensuring it covers the gaps between the corner and the duct wall. Allow the sealant to fully dry before applying the gasket.

Apply neoprene gasket around the perimeter of one duct section of the connection. Start gasketing halfway between corners, favoring the outside edge of the flange. Apply it in an arc at all four corners, making sure to cover the three critical points.

Finally, as you approach the start, press the end of the gasket tightly against the starting point.

TDC & TDF Roll-Formed Flange Connections

Another popular type of ductwork, in addition to our slide-on flange systems, is the TDC & TDC roll-formed flange. When applying gasket, similar application practices can be used in accordance with slide-on flange systems; the only difference is that we recommend our Sticky Tape, formulated specifically for this system type.

Ready to Buy?

Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

October 2025 Newsletter Recap: Connect Round & Flat Oval Ductwork with Confidence

Posted on October 7, 2025 by Ductmate Industries

Renowned for quality and reliability, our round and flat oval connector systems allow you to connect ductwork with confidence. Learn more about our round and flat oval connector systems below.

Connect Round & Flat Oval Ductwork with Confidence

Ductmate offers a variety of round connectors to simplify projects with secure, airtight connections that eliminate the need for extra sealing, as well as user-friendly and cost-effective flat oval connectors ideal for a wide range of applications.

Spiralmate® & Ventmate Round Connector Systems

Sold as a complete set, Spiralmate is a three-piece, self-sealing round duct connector system featuring a one-bolt closure band, providing an innovative and cost-effective solution for fast, safe, and aesthetically pleasing airtight connections.

Beyond innovative design, Spiralmate offers clear advantages over traditional round connector systems. Its engineered simplicity results in a lower overall installed cost, as the complete system eliminates the need for purchasing separate components, sealants, and additional labor. Its unique one-bolt closure band not only speeds up the installation process and reduces potential leakage, but also enhances worker safety by removing labor-intensive and time-consuming screw applications. Eliminating unsightly screws and sealant creates a clean, seamless connection, ideal for architectural applications on exposed duct systems.

Spiralmate installation is quick and easy. Don’t believe us? Watch our full instructional video below that clearly demonstrates the specific assembly and installation procedures associated with the Spiralmate system.

Spiralmate is available in standard sizes ranging from 8” to 72” in 2” increments and in six different alloys with or without mastic for a range of specialty applications. Consult Customer Service for additional sizes and 1” increments. To simplify double-wall installation, press-on inner rings are available, featuring a double-sided pressure-sensitive adhesive to remove the need for costly welding.

For specialized applications, such as underground mining or tunneling, our Ventmate alternative features the same integral sealant and neoprene gasket embedded into a wider closure band to enhance the airtight seal where flush connections are not possible.

ECONOflange™ Round & Oval Connector Systems

The ECONOflange Round and ECONOflange Oval Connector Systems were designed to be user-friendly and provide exceptional performance, making them the most cost-effective and economical round and flat oval flange connection systems in the industry. The connectors’ simple installation process, which utilizes screws to attach the system to the duct wall, makes it easy to install on-site with no special tools required.

Designed as an alternative to our Spiralmate system, ECONOflange Round is available in sizes ranging from 8” to 72” in standard 2” increments as welded or with a split ring to accommodate minor deviations in ductwork. Consult customer service for additional/larger sizes and increment options.

Available in 8” to 56” in standard 2” increments, the modular ECONOflange Oval system consists of semi-circular end flange sections and straight flange. The semi-circular end pieces are sold individually with the bolted connector pieces welded onto the ends to make installation quick, safe, and easy. ECONOflange Oval can be installed on reducing fittings in the same manner as a small end collar, eliminating the need for collars, unlike other traditional connector systems.

Press-on and weld-on inner ring options are available for ECONOflange round, and press-on oval bullnosing is available for ECONOflange Oval. Both ECONOflange Round and Oval are available in additional alloys.

Quick-Sleeve™ Round Connector System

Quick-Sleeve is a single-bolt band clamp that provides a simple, leak-free connection for round ducts and does not protrude into the airstream, making it ideal for air conditioning, ventilation, and dust collection systems.

No end preparation of ductwork is required. To install Quick-Sleeve, simply loosen its bolt, insert each duct about halfway into the connector, and then tighten the bolt. This enables easy connection disassembly and reassembly for ducts requiring periodic cleaning or maintenance.

Single-bolt connections are available for ducts ranging from 3” to 18”. For superior structural integrity, double-bolt connections are available for ducts ranging from 4” to 18”. Additional alloys and gasket options are available upon request.

RELATED PRODUCTS:

Cable Shark® Cable Hanging System

Ductmate’s innovative, next-generation Cable Shark Cable Hanging System is designed and engineered specifically to meet the unique demands and challenges of hanging commercial HVAC duct systems. With unparalleled safety, strength, and reliability, the Cable Shark mechanisms feature an advanced design that includes exclusive built-in load indicators and an easy-to-use load setter/adjustment tool. This helps ensure each system is properly engaged, providing added protection and peace of mind that you and your clients deserve.

The Cable Shark CS125 and CS250 systems comprise high-strength die-cast steel mechanisms and serrated jaws, paired with precision-matched zinc-coated steel cable, to deliver cutting-edge cable hanging systems with an unsurpassed safety factor rating.

A wide range of high-performance accessories are also available to be used in conjunction with the Cable Shark system for versatility on even the most challenging installations, featuring site kits, pivoting eyelets, bracket adapters, rectangular/round duct hanger brackets, studs, and a wide range of cut-to-length cable options with attachments and in 500’ and 1000’ spools.

Round Access Doors

Ductmate offers a variety of round duct access doors for a range of applications, including the Sandwich® Door, ULtimate Door™, and F1 & F2 Doors. Learn more about our round access doors below.

Round Sandwich Door

The Round Sandwich Door is a solid, leak-proof door that is simple to install, providing easy access to round air ductwork and units. Its unique sandwich-style design with knobs that are easily turned by hand allows for effortless opening and closing with no tools required, and no measuring needed, thanks to a provided self-adhesive template.

The Sandwich Round Door is available in both insulated and uninsulated options, as well as a wide variety of alloys.

Round ULtimate Door

The Round ULtimate Door provides easy access to high-temperature air ducts and grease duct systems, and is designed for applications requiring a UL 1978 listing. Unlike shop-fabricated and inferior, light-gauge grease duct door substitutes, Ductmate’s high-performance ULtimate Doors are designed to meet the challenges. They are the most extensively engineered, tested, and ruggedly constructed doors available in the industry.

ULtimate Doors are grease and liquid-tight with minimal penetration into the duct, and are UL 1978-listed and meet NFPA 96 standards. Its sandwich-style design allows them to be completely removed or installed in minutes. No frames to install, no holes to drill, and no clips needed, dramatically reducing field installation time and labor.

The Round ULtimate Door is available in custom sizes ranging from 6×6” to 24×24” in stainless steel 304 or black iron and with optional design features for virtually any configuration. Consult Customer Service for more information.

F1 High-Temperature & F2 Grease Duct Sandwich Round Doors

The F1 Round Door is designed for high-temperature duct applications, featuring a fiberglass rope gasket that allows use at temperatures up to 1,000°F, while the F2 Round Door is designed for grease duct applications, featuring a ceramic fiber gasket that allows use at temperatures up to 2,300° F and meets NFPA 96 standards.

Like Ductmate’s other sandwich-style doors, their unique design features allow for effortless opening and closing by hand with no tools required, no frame to install or seal, and no measuring needed, thanks to a provided self-adhesive template.

The F1 & F2 Doors are available in all standard sizes and in a variety of specialty alloys.

Neoprene Gasket Tape

Neoprene Gasket Tape is a synthetic, closed-cell, and rubber-based duct sealing tape ideal for ensuring a firm, reliable, and long-lasting airtight seal in round and flat oval ductwork.

Its pressure-sensitive adhesive backing allows for quick and easy installation. The durable nature of neoprene foam makes it simple to remove from ductwork without leaving a sticky residue or falling apart. This makes disassembling ducts for periodic cleaning or maintenance easier, allowing for a quick and straightforward application of new tape to reseal the connection.

INDUSTRY NEWS & MORE:

Case Study: Spiralmate & Ventmate Systems Create a Winning Solution for UBS Arena

For years, the New York Islanders hockey team played at the Barclays Center, an arena primarily designed for basketball, which resulted in obstructed views and unfavorable gameplay conditions. In 2017, the team was awarded a new 17,000-person arena: the UBS Arena at Belmont Park.

This project presented a significant challenge, but Spiralmate and Ventmate streamlined the complex installation of massive ductwork during the arena’s construction, enabling a significantly smoother assembly process compared to traditional angle rings.

Click here to read the full case study.

Why Choose Spiral Round Ductwork?

Exposed spiral round ductwork has become a popular architectural feature in both new and renovated commercial buildings. But is the popularity of spiral ducts just a trend, or are there practical benefits to using them? The answer is a resounding yes; spiral round duct is the preferred choice for significant labor savings, higher energy efficiency, increased performance, and more.

Want to learn more? Click here to read Linx Industries’ full article.

Selecting Gasket for Round & Oval Ductwork: Understanding Open vs. Closed-Cell Foam

When sealing round or flat oval ductwork, foam gasket tape is often used to create an airtight seal, maintain energy efficiency, and ensure proper airflow; however, not all foams are created equal. Understanding the difference between open-cell and closed-cell foam is crucial for ensuring a proper seal and avoiding costly mistakes when choosing your materials.

Want to learn more? Click here to read the full article.

DeMI Portal

DeMI has replaced my.Ductmate! Our new e-commerce portal and customer service resource is specifically designed to meet your business needs, providing 24/7 customer service and support. Here, you’ll have access to quotes and order inquiries, price lists, invoices, order search options, shipment information, accounts receivable summaries, credit memo inquiries, and more.

Haven’t signed up for DeMI yet? Sign up now at ductmate.com/demi-request.

PROMOTIONS:

Trapeze Duct Hanger Promotion

Use the code TRAPEZE25 on your next order of Trapeze Duct Hangers during our limited-time promotional period from August through October 2025 to take advantage of our great, new lower price!

Ready to Buy?

Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

Sign up for Ductmate’s e-Newsletter

Don’t miss our monthly e-newsletter! Click here and sign up to receive exclusive Ductmate news and announcements, product information, promotions, industry news, and more, right in your inbox.

Selecting Gasket for Round & Oval Ductwork: Understanding Open vs. Closed-Cell Foam

Posted on September 25, 2025 by Ductmate Industries

What’s the Difference Between Open and Closed-Cell Foam?

The primary difference between open-cell and closed-cell foam lies in their internal structure.

Open-cell foam has interconnected air pockets, making it highly permeable to air and water. While it’s excellent for cushioning or sound absorption, its permeability prevents it from forming an airtight or watertight seal, similar to a sponge. This can lead to air leaks, moisture absorption, and potential mold growth in HVAC systems.

Due to its permeability, open-cell foam is generally not suitable for sealing ductwork. It is more commonly used for projects that require acoustic absorption, padding and cushioning, such as in furniture and bedding, as well as for air sealing where moisture isn’t an issue, like in interior walls and attics.

Closed-cell foam, on the other hand, is composed of individual, sealed cells that resemble tiny balloons packed tightly together. This structure makes the foam highly resistant to air and moisture, making it ideal for insulation and sealing. It is also denser and more durable than open-cell foam, resisting compression set, which is the tendency for it to lose its thickness after being compressed.

While both open and closed-cell foam have their uses, closed-cell foam is the clear choice for ductwork because it creates an effective seal by resisting air and moisture, preventing leaks and condensation.

Why is Neoprene Gasket the Best Option for Round & Oval Ductwork?

Among the closed-cell foam gasket options, neoprene is a superior material made from synthetic rubber, ideal for sealing round and flat oval ductwork. Its unique advantages make it the best choice for ensuring a reliable and long-lasting seal.

Excellent Sealing Properties: Closed-cell neoprene provides a firm, airtight seal, which is critical for preventing air leaks in round and flat oval ductwork. Its ability to conform to irregular surfaces while maintaining integrity ensures a reliable seal.
Durability and Resilience: Neoprene is highly resilient and resistant to compression set. This means it can withstand the constant pressure and vibration common in HVAC systems without losing its shape or sealing effectiveness over time.
Flexibility: While durable, neoprene remains flexible, which is essential for creating a tight seal around the curved surfaces of round ductwork. This flexibility allows it to compress evenly around the flanges.
Clean & Simple Removal: The resilient nature of neoprene foam makes it easy to remove from ductwork without leaving behind a sticky residue or falling apart. This simplifies the process of disassembling ductwork for periodic cleaning or maintenance, allowing for a quick and easy application of new gasket tape to reseal the connection.

Where Can I Buy Ductmate’s Neoprene Gasket Tape?

Ready to buy our neoprene gasket tape? Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

Spiralmate & Ventmate Round Duct Connector Systems Create a Winning Solution for UBS Arena

Posted on September 16, 2025 by Ductmate Industries

For years, the New York Islanders hockey team played at the Barclays Center, an arena primarily built for basketball. This arrangement led to obstructed views for fans who often had to watch the game from the scoreboard, and poor ice conditions and unfavorable gameplay for players were caused by the old piping system. The team finally caught a break in 2017 when they were awarded a new 17,000-person arena: the UBS Arena at Belmont Park.

When it came time to select a sheet metal subcontractor for the UBS Arena, many companies competed for the job. Ultimately, Triple S Air Systems, a Long Island-native company, won the bid. The project presented a significant challenge: installing a large amount of spiral ductwork in the arena’s “bowl,” with some pieces reaching massive sizes of 96″, 86″, and 76″. To add to the difficulty, the ducts had two inches of internal insulation.

Fortunately, Triple S was no stranger to large-scale ductwork. In 2016, they successfully installed 76″ spiral ductwork during the enclosure of the Arthur Ashe Stadium, the project during which they first used Ductmate’s Spiralmate system. They were impressed with the product’s one-bolt closure and self-sealing flanges, which made installation quick and easy.

Normally, large-diameter spiral pipes require expensive companion angle rings for reinforcement. However, during the bidding phase, Ductmate proposed an innovative solution: using Spiralmate alongside a similar product called Ventmate. Traditionally used in mining and tunnel applications, Ventmate features a wider closure band with an integrated neoprene gasket. This design allows for a secure seal even when duct runs are slightly misaligned. For the UBS Arena project, this wider band made installing the larger ducts significantly easier and eliminated the need for a separate gasket on the mating face of the flanges.

Triple S Project Manager Greg Cross had nothing but praise for Spiralmate and Ventmate. These systems enabled a significantly smoother assembly process compared to traditional angle rings. The team was able to pre-build sections of ductwork in their shop, installing the outer and inner rings before bringing them to the job site. This process, combined with the one-bolt closure band, allowed workers to avoid climbing on top of the ductwork to secure connections, resulting in significant labor savings and a safer installation environment.

Construction on the arena was underway when the COVID-19 pandemic hit, halting all non-essential projects in New York City. Despite the jobsite closure, Triple S continued to manufacture the necessary ductwork. Cross commended Ductmate for its ability to meet lead times and maintain a steady supply of materials, while many other suppliers faced significant supply chain disruptions.

In the end, the project utilized 643 Spiralmate and Ventmate three-piece systems and 752 2″ inner rings.

Cross’ final recommendation speaks for itself, “I would 100% recommend Ventmate and Spiralmate for future projects where a large-diameter duct is going to be utilized.”

my.Ductmate Replaced by DeMI

Posted on August 18, 2025 by Ductmate Industries

Starting on August 18, 2025, my.Ductmate will be shut down and replaced by DeMI, our new e-commerce portal and customer service resource.

In 2024, we launched a beta version of DeMI, and it is now being made available to all customers. All current my.Ductmate users have been previously notified to set up DeMI accounts before the shutdown date to ensure no information is lost in the process.

Haven’t signed up for DeMI yet? Sign up now at ductmate.com/demi-request.

The DeMI portal has been specifically designed to meet your business needs, providing 24/7 customer service and support. Here, you’ll have access to the following features and more:

Quotes & Order Inquiry

Generate your own quotes and submit orders directly into our system, or view quotes and orders created by our Customer Service team

Price Lists

View items and their corresponding unit net prices

Invoices

Receive instant access to a list view of recent invoices

Order Search Options

Quickly search for ordered items by date in weekly increments, item number, or open order items

Shipments

Search for shipments by carrier, purchase order number, order or invoice number, shipment date, or invoice date, as well as obtain tracking information

Accounts Receivable Summary

View an aging summary of payables

Credit Memo Inquiry

View your list of recent credits and their status

PolyArmor vs. Traditional Fiberglass & Elastomeric Duct Liner Insulations

Posted on April 16, 2025 by Ductmate Industries

While fiberglass and elastomeric duct liner insulation have traditionally dominated the market, Ductmate’s PolyArmor polyester insulation has emerged as a superior alternative, offering a compelling blend of performance, installation, and environmental benefits.

Fiberglass: The Traditional Choice with Limitations

Fiberglass insulation is known for its affordability and thermal resistance. However, it presents several drawbacks:

Fiber Shedding: Fiberglass easily breaks down and releases microscopic fibers into the airstream, posing potential health risks and requiring careful handling and installation. In time, this can lead to costly repairs and replacement of the insulation.
Moisture Absorption: While fiberglass itself does not provide food for mold, when it does collect moisture, dust, dirt, and other organic debris trapped inside can act as a breeding ground for mold.
Installation Challenges & Environmental Concerns: Installing fiberglass can be challenging, requiring specialized tools and protective gear. During installation or if the insulation is disturbed, some individuals may experience temporary irritation of the skin, eyes, nose, and throat from both the fiberglass fibers and the formaldehyde released.
Reduced Effectiveness: If fiberglass insulation is compressed, its thickness will go down, leading to a reduced overall R-value/thermal resistance.

Elastomeric: Flexibility and Moisture Resistance at a Cost

Elastomeric insulation, often favored for its flexibility and closed-cell structure, offers excellent moisture resistance and condensation control. However, it also comes with its own set of drawbacks and considerations:

Higher Cost: Not only is elastomeric material more expensive compared to other insulation types, but it also can be up to four times more expensive to install.
Installation Complexity: Proper elastomeric installation requires specialized adhesives and techniques that significantly increase installation and labor costs.
Can Break Down: Over time, elastomeric, especially when exposed to exterior conditions, can break down due to factors like UV light and mechanical damage. This can lead to costly repairs and replacement of the insulation.

PolyArmor: A Strong, Safe, and Superior Alternative

Ductmate’s PolyArmor polyester insulation is engineered to address the shortcomings of traditional insulation materials, offering a superior alternative with several compelling advantages:

Fiber-Free and Safe: PolyArmor eliminates fiber shedding and does not break down in the airstream, creating a cleaner and healthier indoor environment. Its polyester material is soft and hypoallergenic, eliminating irritation during handling that you would typically experience with fiberglass insulation.
Superior Moisture Resistance: PolyArmor’s polyester construction provides exceptional resistance to moisture and condensation, minimizing the risk of mold growth.
Easy Installation: Designed for ease of installation, PolyArmor reduces labor costs and installation time, with its flexible nature allowing it to conform to any duct shape.
Enhanced Thermal Performance: PolyArmor provides industry-leading R-values/thermal resistance, contributing to increased energy efficiency and reduced system load.
Durability and Longevity: PolyArmor is engineered from strong and safe polyester that is webbed into a thermal blanket, which is then bonded with an extremely durable FSK-facing that reduces damage during fabrication, operation, and cleaning.
Environmental Benefits: Made with environmental sustainability in mind, PolyArmor is manufactured from 25% recycled content.

Quick Comparison Chart

Where Can I Buy PolyArmor?

Ready to buy PolyArmor? Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

Variety of Ductmate Products Now GREENGUARD Gold Certified

Posted on February 17, 2025 by Ductmate Industries

Proven to comply with the world’s strictest and most comprehensive standards for low-volatile organic compounds (VOCs) in indoor air quality, a variety of Ductmate water-based adhesives, encapsulating edge coatings, and water-based sealants are now GREENGUARD Gold Certified!

What is a GREENGUARD Certification?

Ever wonder what the GREENGUARD logo means on a product? It’s more than just a sticker – it’s a symbol of cleaner, healthier indoor air. The GREENGUARD Certification process is rigorous, putting products through intense scientific testing to ensure they meet strict chemical emissions standards. Think of it as a quality check for the air you breathe.

UL GREENGUARD Certification gives manufacturers and retailers a powerful way to show they care about your health and the environment. It’s proof that their products release fewer harmful chemicals into your indoor spaces. In today’s market, where consumers are increasingly health-conscious, this certification offers a real edge, demonstrating a commitment to both people and the planet.

But there’s an even higher standard: GREENGUARD Gold Certification. Formerly known as GREENGUARD Children & Schools and GREENGUARD Select, this certification takes things a step further. It’s designed with extra safety factors to protect our most vulnerable populations, such as children and older people. When you see the GREENGUARD Gold logo, you know the product is suitable for even the most sensitive environments like schools, hospitals, healthcare facilities, and daycares. It’s truly the gold standard for indoor air quality.

Not only does GREENGUARD Gold limit emissions of over 360 volatile organic compounds (VOCs) and total chemical emissions, but it also meets the stringent requirements of the California Department of Public Health (CDPH) Standard Method (also known as California Section 01350). This means these products have passed some of the toughest air quality tests in the country.

Which Ductmate Products are GREENGUARD Gold Certified?

Ductmate’s GREENGUARD Gold Certified products include a variety of our water-based adhesives (Gecko Glue Concentrate, Gecko Glue Gold, Gecko Glue Silver), our water-based sealants (PROseal, FIBERseal, EZseal, EVERseal, and PROseal Spray), and our Super Liner Seal (SLS) and LAG-IT encapsulating edge coatings.

Why is Indoor Air Quality Important?

People spend a staggering 90% of their time indoors. But what if the air we’re breathing inside is actually more polluted than the air outside? Shockingly, indoor air quality (IAQ) can be up to five times worse than outdoor air, posing a significant threat to our health and well-being.

The U.S. Environmental Protection Agency (EPA) ranks indoor air pollution among the top five environmental risks to public health. This isn’t just a minor concern; the World Health Organization estimates that a staggering 3.8 million people die prematurely each year from illnesses directly attributable to indoor air pollution.

The effects can be both immediate and long-term. In the short term, poor IAQ can manifest as headaches and irritation of the nose, eyes, and throat. Furthermore, flare-ups of conditions like pneumonia and bronchitis can be triggered by indoor air pollutants.

The long-term effects are even more concerning. Prolonged exposure to poor IAQ can increase the risk of cardiovascular disease. Certain indoor pollutants are known carcinogens, contributing to the risk of lung cancer. Additionally, indoor air pollution can worsen existing respiratory issues like asthma, making breathing even more difficult.

What Made Ductmate Products a Good Fit for GREENGUARD Certification?

The products mentioned above were the perfect fit for the GREENGUARD Gold Certification because they meet strict chemical emissions standards.

Low VOC Emissions: GREENGUARD Gold Certification requires products to have very low levels of VOC emissions. Ductmate products meet this standard, contributing to improved indoor air quality.
UL 2818 Compliance: Ductmate products are tested and certified to meet the requirements of UL 2818, a standard for chemical emissions for building materials, finishes, and furnishings. This ensures that they are safe for use in indoor environments.
LEED Compliant: GREENGUARD Gold Certified products can contribute to LEED credits, making them a sustainable choice for building projects.
Health and Environmental Benefits: Ductmate’s GREENGUARD Gold Certified products can help improve the health and well-being of building occupants by reducing indoor air pollution. Additionally, they contribute to a healthier environment by minimizing the release of harmful chemicals.

Overall, Ductmate’s commitment to producing sustainable and low-emission products aligns well with the goals of GREENGUARD Gold Certification, making our products a valuable choice for those seeking to create healthier and more sustainable indoor environments.

Where Can I Buy Ductmate Products?

Ready to buy Ductmate’s GREENGUARD Gold Certified products? Ductmate products are available at over 350 locations across the US as part of a selective distribution network. Use the Ductmate distributor locator map to find a distributor near you.

Outside the US? Check out our international distributor list. For detailed information on product availability, lead times, or other international sales requests, please email ductmate@ductmate.com.

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