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.
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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!
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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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