Get To Know Your Water-Based Duct Sealants

Posted on November 9, 2020 by Ductmate Industries

Technical Data Sheets – From Confusion to Clarity

Technical Data Sheets (TDS) related to water-based duct sealants can be just as intimidating as synonyms for the first word in the acronym, erudite or abstruse. These data sheets are provided to give specifics about the performance of each product for better product selection. However, the list of standards (NFPA 90A and 90B or ASTM C794), complex acronyms (TVOC Emissions CDPH Standard Method v1.1), and scientific units (cps or PLI) could leave the average person confused and allowing price to be the leading factor during selection. The truth is that engineers provide this information because they are truly dedicated to the product they worked very hard to develop, and would like to share all of the technical information possible explaining the positive attributes of the sealant itself. Ductmate understands that this information is not the easiest to grasp, and therefore, this article aims to describe a few key test specifications that may not be so obvious to understand at first glance.

Solid Content is one of the most misunderstood specifications most duct sealant manufacturers report on their technical data sheets. In most cases, more is better (unless you are playing golf). Solid content is a lot like your ideal golf game. Water-based duct sealants start out with a polymer that is the backbone of any formulation. These polymers are between 50-55% solids (the other 45-50% is water). To get the solid content to reach “typical” levels of 60-80% for the average sealant, 100% solid fillers are added. These fillers will reduce the water content in the formulation leading to quicker dry times and reduced cost, but most fillers provide little performance characteristics and will eventually lead to negative returns when added at an elevated level.

For the sealant to maintain other critical performance characteristics like flexibility and adhesion, there must be enough polymer in the formulation to hold all of the filler together. Envision a ball pit or a sandbox. In either case, it would be very difficult to cover the entire surface area of the particles without reducing the amount of those particles present. Ideally, a combination of large particles and smaller particles lends to better packing of the fillers.

This allows for the dried sealant to be a strong, flexible coating that will hold up to the harsh conditions a duct system may go through during its lifetime (vibrations, expansion/contraction as air begins to fill the duct, or transferring between cold and hot conditions). Sealants that contain too much filler, or only one size of filler, could result in cracking and poor adhesion. Just think, if there is not enough polymer to surround all of the filler present, how will there be enough to bind to the steel or hold all of the particles together during movement? Flexibility and adhesion are perhaps the two most important characteristics of any duct sealant. These characteristics can be accidentally ignored when choosing a duct sealant based on a high solid content.

Tricks of the Statistics: Solid Content can be linked to performance characteristics like Flexibility and Adhesion, but they are also typically proportional to other common specifications on a technical data sheet. For instance, when the solid content is in the 70-80% range, the density (how many lbs. are in a one-gallon pail) is also typically higher. This could lead to higher shipping costs. Viscosity is also typically affected at high solid content levels. The higher the solid content, the thicker the sealant tends to be. If the product is too thick, the sealant will be harder to brush. In this case, excess sealant is often used driving up the cost of the job.

Below is a table breaking down some key technical data and how each relates directly to a Ductmate Water-Based Sealant. We hope this chart can help end users select which sealant is right for their own use. For example, if you want a product with great adhesion to steel, is easily spreadable, LEED compliant, and matches the color of steel = EVERseal. If you want a product that adheres very well to multiple substrates, is great for outdoor use, can be used in high pressure systems, and is LEED compliant = PROseal. If you want a premium product that is also sprayable = PROseal Spray.

Ductmate Sealants	Adhesion to Metal	Adhesion to Flexible Duct Connectors	Flexibility	Outdoor Applications	Brush Drag	Sag Resistance	<15" Water Gauge	LEED Compliant	Fiber Texture	Sprayable	Color Match to Galvanized Steel
PROseal	•••	•••	•••	•••	••	•••	•••	Yes	No	No	•
FIBERseal	•••	•••	•••	•••	••	•••	•••	Yes	Yes	No	•
EVERseal	•••	••	•••	••	•••	••	••	Yes	No	No	••
EZseal	•••	••	•••	••	•••	••	••	Yes	Yes	No	••
PROseal Spray	•••	•••	•••	•••	n/a	•	•••	Yes	No	Yes	•

••• = Excellent
•• = Above Average
• = Standard

For more information, please visit our Water-Based Sealant page or to download Technical Data Sheets for any of our products, please browse our Technical Resources page.

Ductmate 45 Industrial Duct Connector On The Fast Track In LA!

Posted on October 8, 2020 by Ductmate Industries

Contractors Turn to Ductmate’s Industrial Duct Connector for City of L.A. Transit Station Project.

The Los Angeles County California Metro is amongst the nation’s largest and premier transportation agencies, and it serves as transportation planner, coordinator, designer, builder, and operator for one of the country’s largest, most densely populated and developed counties. More than 9.6 million people – nearly one-third of California’s residents – live, work, and play within their 1,433-square-mile service area. Beginning in 2014, the LA Metro began an ambitious project to extend their existing Crenshaw/LAX transit line to better serve the cities of Los Angeles, Inglewood, El Segundo, and portions of unincorporated Los Angeles County. This would extend the existing Metro E Line at Crenshaw and Exposition Boulevards in Los Angeles and merge it with the Metro C (Green) Line at the Aviation/LAX Station on Aviation Boulevard and Interstate 105 in the City of El Segundo.

The new state of the art Metro Rail extension would offer an alternative transportation option to congested roadways and provide significant environmental benefits, economic development, and employment opportunities throughout Los Angeles County. Riders will be able to make easy connections within the entire Metro Rail system, municipal bus lines, and other regional transportation services. Equally important, it will dramatically reduce travel times, inefficiencies, and lower transportation costs while improving the quality of life for commuters and residents as well as benefiting the surrounding environment. The ability to foresee such an innovative concept, let alone engineer such a monumental and technically complex project that would ultimately result in such a vast number of socioeconomic solutions, is hard to put into words.

It was the underground stations where Metro had a particularly challenging objective. Tunneling under countless buildings and congested streets overhead in a seismically active area, engineers and contractors had to bring in fresh air for the passengers waiting to board. At this point, the HVAC Contracting Companies of Limbach and Superior Duct were tasked with sourcing and installing the critical air systems needed. With ductwork exceeding 45 square feet in 20’ sections, the contractors had to be extremely selective in the connection system they would use on the job. It would be imperative they complete their work in a timely fashion to ensure the project kept moving and on schedule. Because of the unique belowground operation, the HVAC system has to withstand very rigorous operating standards, as well as meet the engineering standards for catastrophic events such as an earthquake. The ductwork would have to tolerate up to 14” positive and negative pressure and operating temperatures exceeding 480 degrees.

“Because we have so many types of construction, it requires so many types of specialties. The construction managers all have to have different types of training, and coordinating that to make sure we have the right resources at the project at the right time based on what’s going on – that’s a complexity for us, and something we have to manage.”

– Stephanie Leslie | Deputy Executive Officer, Construction

One of the key points the contractors have stressed as a primary reason for turning to Ductmate Industries, and making the switch from companion angle frames to Ductmate 45 Industrial Rectangular Duct Connector System on this project, is the universal acceptance of the Ductmate Brand, the product’s performance, and the engineering and technical support behind the product.

The Ductmate 35 and Ductmate 45 Rectangular Duct Connector Systems both were designed and engineered to increase the overall performance (airtight and structural integrity) of commercial and industrial HVAC systems, and are the most independently tested and widely used connector systems in the world. Ductmate Industries’ engineering department built industrial sections of duct using the DM 45 connector system and tested it well beyond the performance requirements of the LA Metro project to confirm and support testing completed to achieve approval for this project. The Ductmate Connection system has been through rigorous shaker testing and simulations specifically for critical projects in earthquake prone regions. Also, because of the extremely high temperature requirements of this project, a specialized silicone sealant was used between the flange faces at each 20’ duct joint. The silicone sealant worked perfectly with the Ductmate 45 System and achieved optimal results for this high temperature application.

In addition to the high-performance characteristics of the Ductmate system, possibly the most compelling reason the product was selected was the inherent cost savings associated with the Ductmate 45 system versus companion angle flanges. The fabrication of connections for HVAC systems utilizing companion angle is an egregiously labor-intensive process. Although project specifications can vary from project to project, in general companion angle is hard to cut, requires countless number of holes to be drilled, must be painted to prevent rust, requires certified welders to join angle together and to attach to the duct wall, and then attached with equally countless number of nuts and bolts. Ductmate 45 is a self-sealing slide-on connector system where no welding is needed to achieve an airtight seal. Its 4 -bolt design with optional bolt-on or snap-on cleat (which replaces countless nuts and bolts) makes ease of installation and airtight integrity simple, thus it has become the clear choice over labor-intensive companion angle.

Learn How To Install The Ductmate Flange Connector System

Ductmate Industries has always been viewed as the industry leader within the commercial and industrial HVAC industry. Needless to say, due to the performance characteristics and being vastly more labor-saving, the Ductmate 45 System was approved and used over the initially specified companion angle. Once approved, the contractor drew upon Bay Insulation/CWCI for just-in-time delivery and service to ensure a seamless supply of Ductmate 45 components.

It is a unique project like the Crenshaw/LAX Transit Stations where the versatility and quality of Ductmate products and its engineering staff truly shine. For over 40 years, Ductmate has been partnering with companies in the commercial and industrial HVAC space to solve challenging and unique mechanical problems in every conceivable alloy. Ductmate products have been installed in virtually every type of commercial and industrial HVAC system imaginable including transportation hubs, data centers, waste-water treatment plants, processing plants, and countless other project types for companies such as Google, Microsoft, Facebook and Disney, to name a few. Upon the project’s expected completion in 2021, the LA Transit line will be one of the most advanced, efficient, safest, and environmentally friendly transit systems in the world, consisting of 3 underground terminal stations and miles of below and above grade track. Ductmate Industries is proud to assist in making this project a success.

Crenshaw/LAX Metro Update Video | The Ductmate 45 Flange Connection System Can Be Seen Throughout

Sources:
Crenshaw/LAX Metro Website

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Clean HVAC Preventative Measures, And Ductmate Solutions You Can Clearly See

Posted on September 1, 2020 by Ductmate Industries

The Fight For Indoor Air Quality Has Never Been More Critical – And Ductmate Products Offer A Clear Advantage

Originally designed for use in hospitals, Ductmate’s Observation doors allow you to be vigilant over your air filtration system. Now more than ever, we must ensure our work environments are protected against harmful, air-born substances. The Sandwich® Observation Doors are constructed from precision stamped steel and high impact safety glass to be used in all pressure classes, including high-pressure duct systems. The patented Ductmate Sandwich® Observation Access Door design eliminates bending metal tabs, leaking frames, and worrying about scratched or worn glass; therefore, leaving you with the peace of mind all preventative measures have been considered.

Typical In-Duct UV Light System With Ductmate Sandwich Observation Doors

“As facilities are beginning to reopen, many companies are looking to add UV technology to help address concerns over air quality, reassuring building occupants they are doing the most they can to ensure safety in the workplace.”

– Aaron Engel, VP For Business Development, Fresh-Air UV

Below is a breakdown on all the advanced feature that Ductmate Sandwich Observation Doors offer over a basic viewport door.

Please visit the specific product page for more detailed information on each door.

16×12 Observation Door

AHU Observation Door

Single Pane Observation Door

Promotional pricing for all our Observation Doors is currently available please contact us today for more information or click here to find a Ductmate Distributor near you.

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Spiralmate® Round Ductwork System Is Working Well in South Dakota

Posted on October 24, 2017 by Ductmate Industries

The Prairie Lakes Wellness Center in Watertown, S.D., a modern community center conveniently located in the fastest growing area of Watertown, opened in April 2017 and has 104,000 square feet of space. The $24 million multi-level facility features multiple basketball courts, racquetball courts, a running track, a sauna and whirlpool, a large fitness area, and a state of the art pool area that includes a leisure pool as well as a competition pool.

Choosing the Right System for Aesthetics and Performance

For areas that are not exposed, rectangular, medium-pressure ductwork was chosen. For exposed areas, the Spiralmate® Round Duct Connection System was used. All the spiral connections were manufactured by Ductmate Industries, Inc.

Gary Chappell, Ductmate Regional Channel Manager, said the spiral ductwork is exposed and visible from multiple perspectives. On the second floor, where the ceiling for downstairs is positioned at eye level, it was even more important to have an attractive product. Chappel said, “The project is aesthetically pleasing both close up and from a distance. From a performance standpoint, the system is airtight, efficient and doesn’t require any additional sealing.”

Jon Burri, Vice President at Creative Metal Solutions, the specifier and fabricator for this project, said everything went very smoothly on the job site. “We made custom lengths in the shop and delivered them to the jobsite, ranging in size from as large as 42” in diameter to as small as 10” in diameter. Large amounts of 28-32” ductwork were installed above the track, and 18-20” inch segments were installed in the workout areas.”

The ductwork in the pool area was double-walled aluminum to reduce the sound of the airflow from spectators and to prevent corrosion from the harsh pool environment. Galvanized steel was used on all the ductwork in other areas.

MacArthur Co. was the distributor for this project. According to Chappell, “They have been a great asset and long-standing Ductmate distributor in Sioux Falls.”

Burri said a couple of trailers of product a week were sent to the jobsite on and off for about six months. “We delivered in phases so that a lot of room wasn’t needed to store product during the entire job,” he said.

The company always recommends the Spiralmate® system because, Burri said, “The cost is always justified with savings in field installation time and cost, and it allows for an air-tight system that looks great.”

Faster Installation, Big Labor Savings
Active Heating, Inc., based in Watertown, S.D., was the HVAC contractor. Jason Roehrich, Vice President at the company, said the installation of the Spiralmate® system is usually fast, but this project went even faster than normal.

“The finished job features a wide-open, exposed look with neat, straight long runs,” he said. “In one area, we had a run of 100-150 feet with a 90-degree turn into another long run of about 300 feet, and it looks great.”

Roehrich added, “Our installers in the field really like the Spiralmate® system because it quickly snaps in place, provides a great seal, installs faster than other products, and it provides a straight, clean look when it’s finished.”

Another advantage of the system is that when a piece of ductwork is cut down in size, the flange can be removed and re-used—unlike with other systems. This saves even more time and money.

The end result was a successful project for Ductmate and everyone else involved. The state-of-the-art Prairie Lakes Wellness Center has an HVAC system to match that’s pleasing to the eye, energy efficient and will perform well for many years to come.

PROseal Spray Duct Sealant Shortens Application Time By 50%

Posted on February 18, 2014 by Ductmate Industries

Studies and testing have demonstrated that heating and cooling systems can lose up to 30% of their efficiency due to leaks in the duct joints and seams. One solution is to seal the ductwork at the joints with gasket material supplied by the manufacturer. Another is the application of duct sealant that can be applied at the joints as well as duct seams for a tight connection.

New standards in the building industry now require all ducting to be sealed to prevent air leakage. Not only does it save energy, low leakage reduces the load on the heating and cooling equipment.

Scott Schindler, owner of Schindler Heating & A/C, Inc., runs his business in Boonville, IN. For over 15 years he has installed and serviced air conditioning and heating equipment in southern Indiana.

Schindler has four employees and works primarily on residential and light commercial housing. As a businessman, he believes every job he does gets 110% of his efforts—a main reason he is the HVAC installer choice for many of the largest builders in his area.

Schindler has used Ductmate’s PROseal mastic for many years. Like most duct sealants, it is applied manually and can take an entire day to finish one house. The results were always good, but if you are not careful you can wear as much as you apply.

While picking up materials at Wilhite Supply Co, his local Ductmate distributor, Schindler was introduced to PROseal Spray, Ductmate’s premium water-based, high velocity duct sealant that can be applied using a wide range of sealant application equipment. It was love at first sight!

“I’m somewhat of a tool nut and am interested in anything mechanical,” said Schindler. “The fact that you can apply duct sealant using a spray system really intrigued me; five minutes later I was a believer.”

Schindler had investigated other brands of spray mastics as well but found one major problem. Most sealant manufacturers strongly recommended using their spray system. These systems cost on average $7,500 a unit, a greater investment than he wanted to make.

“We found out that Ductmate’s PROseal Spray can be used with a variety of spray systems with no problems in application or performance,” said Schindler. “In the end I purchased a sprayer for $1,700, and that was even for a slightly better unit than I needed.”

Christian Nauman, Sealants & Adhesives Product Line Manager for Ductmate, says ProSeal® Spray offers contractors benefits other than speed of application. “Ductmate formulated ProSeal® Spray as an extension of our manually-applied ProSeal® product,” said Nauman. “Both are designed to seal metal and metal joints against air leaks in low, medium, and high pressure duct systems up to 15” w.g.”

ProSeal® is a premium water-based high-velocity duct sealant that is non-flammable with a low odor and low VOC off-gassing. This is important for contractors working in tight spaces for prolonged periods of time.

ProSeal® Spray has excellent adhesion to all types of metals, and will not drip or sag under normal application conditions. The sealant has a very low shrinkage rate and remains permanently flexible over the life of the product. It is also UV, water and mildew resistant, and can be used on painted latex or epoxy finishes.

Upon using the PROseal Spray for the first time Schindler said he was a little apprehensive it would work as promised because of the viscosity of mastic. It didn’t take long to convince him otherwise.

“Our sprayer has a 150 foot hose allowing us to reach most of the house without moving the unit,” Schindler remarked. “We can finish an entire house in 30 minutes compared to an entire day using manual application.”

Many of the builders Schindler works with construct Energy Star homes. These buildings have to pass strict requirements minimizing air leakage for the building as well as the HVAC ducting. Schindler sprays all seams and joints with PROseal Spray with great success.

Schindler says his duct installations always pass with ease, and the inspector says his work is the best he has ever seen.

Once finished, the spray unit must be cleaned before the mastic hardens. Schindler says all that is needed are a few gallons of hot water that he runs through the sprayer until it runs clear. Since PROseal Spray is water-based, no harsh cleaners are required.

In addition to duct sealing, Schindler has found another use for the product. With PROseal Spray’s excellent adhesive qualities, he uses it to seal holes and cracks in the building that he may come across in places like crawl spaces.

New Polyester Duct Liner Less Expensive, Reduces Installation Time

Posted on July 19, 2013 by Ductmate Industries

Schreiber Foods is constructing a new corporate headquarters and global technology center in downtown Green Bay, WI. Founded in Green Bay in 1945, it lays claim to be the world’s largest employee-owned dairy company. The $50 million headquarters building is 235,000 sq. ft. and reaches five stories high with a fit-out of primarily office space. When completed, it will employ approximately 550 people in the greater Green Bay area.

The firm Hammel, Green and Abrahamson (HGA Inc.) is an integrated architecture, engineering and planning company responsible for the HVAC system design along with other mechanical systems on the Schreiber Foods Project. Kevin Pope, Senior Mechanical Engineer and Vice President at HGA, is the Engineer of Record on the project.

“For most ducting projects of this type, we typically specify a polyimide foam liner for the supply ducting and a fiberglass liner for the return,” said Pope. “The reason for this is any fibers coming off the fiberglass liner are captured in the air handling filtration system before it reenters the supply air. It’s also a way to keep cost down since fiberglass is less expensive and offers reasonable sound attenuation.”

The polyimide foam is generally coated with an acrylic-type polymer when used for duct liner. The coating provides a protective barrier against dust and moisture from collecting in the duct. However, one of the drawbacks to the polyimide foam can be more expensive than other materials.

J. F. Ahern Co. is the mechanical contractor for the project and responsible for the sheet metal and other mechanical systems. Shaun Neubauer, Project Manager for J.F. Ahern, has as one of his primary functions – the need to control project costs.

“It’s part of my job to control project costs so I begin immediately looking for alternative material choices,” said Neubauer. “We noticed immediately that the polyimide foam cost was coming in rather high and we began investigating alternative duct liner material. We had an opportunity to meet with Ductmate Industries to compare their new PolyArmor polyester-based liner material.”

PolyArmor is new to the market, having been out only one and one-half years. It is a polyester duct liner used in forced air heating, ventilating, and air conditioning systems. It is engineered to provide industry leading R-values with excellent noise reduction values and superior indoor air quality.

The polyester material is webbed into a thermal blanket which is then bonded with an FSK facing to resist damage during system installation and operation. It also provides excellent durability in the airstream.

Neubauer said the PolyArmor met the specification requirements and he was nicely surprised with the cost estimate. Since the polyimide was specified, he submitted the PolyArmor cost saving and specifications to Pope and requested a substitution, which was approved.

J. F. Ahern and Neubauer have a long history working with Ductmate Industries. Quite often they specify other Ductmate products like access doors, connectors and vane systems. Their relationship was a key factor in their decision to install the new PolyArmor liner material.

More emphasis was placed on noise reduction than insulation values although both were important. The PolyArmor proved excellent for sound attenuation with a .65 NRC rating while also delivering a R5 insulation value in one-inch material thickness.

Duct sizes vary, having dimensions up to 6’ by 3’ and handling an air flow of up to 80,000 CFM. The specifications called for the PolyArmor installed approximately 20’ downstream from each VAV discharge connections.

Chris Elwing, Shop Manager for J.F. Ahern, was impressed with the installation performance of PolyArmor. With over 31 years working the sheet metal industry, 13 of those with J.F. Ahern, he’s seen his share of duct insulation.

“We install all duct liners at the shop and have had to use elastomeric-type product for many of our installations,” said Elwing. “Elastomeric material is tough to work with because it’s hard to cut and shape into place.”

“We had never used the PolyArmor liner before and discovered that it installs much faster and is easy to pin; It greatly reduced our man hours on the project.” Elwing estimated they installed 25,000 sq. ft. of the liner material, all installed by hand using no coil machine. Even with the additional labor time required, he cut his installation time by 30% or more!

The PolyArmor liner is installed to the duct surface using water-based adhesives. This eliminates the need for solvent-based bonding agents that emit VOC’s for many years after installation. The polyester base material does not promote or support the growth of mold or mildew making it very desirable for a healthy environment and occupant safety.

The net result was even better than expected.

Neubauer commented, “Not only did we reduce costs for the liner material, we saved another 30% on installation time, which is significant.”

Both companies agree they will use the PolyArmor on future projects.

Introducing the 16×12 Double Paned Observation Door

Posted on June 26, 2013 by Ductmate Industries

This door was designed specifically for hospitals, clean rooms, pharmaceuticals, and laboratories to eliminate danger of dust contaminating ductwork while inspecting in-duct smoke detectors, UVC emitters, fire and smoke dampers, and humidifiers. Read more about this newest addition to the Sandwich Door line here.

High Ceiling Project Makes Spiralmate A Must

Posted on November 9, 2012 by Ductmate Industries

The North Shore Marine Transfer Station is located in College Point near New York City and LaGuardia Airport. It is expected to open in the spring of 2013 and will haul about 3,000 tons of garbage from Queens borough by barge to landfills each day.

The facility is enclosed to limit bird attraction, which can be very detrimental to airplane traffic at nearby LaGuardia Airport. It was birds after all that were sucked into both engines of Capt. Chesley “Sully” Sullenberger’s airplane causing him to ditch in the East River. The North Shore transfer station is only 735 yards from one of LaGuardia’s runways.

The spiral duct manufacturer on the projects is Southern Tier Custom Fabrication located in Elmira, NY. Sothern Tier has been a loyal user of Ductmate® products for many years, especially the Spiralmate® spiral duct connector.

Ian Morrell, Vice President of Southern Tier is very proud of their relationship with Ductmate. “We really believe in Ductmate’s innovative approach especially with products like the Spiralmate,” said Morrell. “They are easy to install and are real time savers in the shop and in the field.” Morrell said the company has enjoyed incorporating the Ductmate line into their fabrication process for about 30 years. He said they are also an installing contractor, however not on this particular project.

Because the North Shore Transfer Station is a marine facility, it is naturally in a corrosive environment. The saltwater air will eventually start corroding any steel product including galvanized spiral ducting. The project was specified with 316 stainless steel to counter the corrosive seawater environment and any toxic off-gassing from the trash.

Stainless steel is also very expensive, almost five times that of regular steel, and Morrell said it’s important the spiral ducting installs correctly and without any damage.

Morrell said Ductmate offers their Spiralmate in a variety of materials that include galvannealed, aluminized, 304 stainless, 316 stainless and PVC coated. In addition, the Spiralmate has a sealing mastic in the pocket of the flange that eliminates the need to manually add sealant during assembly. Ductmate guarantees the flange will seal from 18’’ positive to 10’’ negative WG. The mastic is non-hardening and non-drying and will not crack when transported to the shop site by truck.

The sheet metal contractor on the project is Delta Sheet Metal Corporation located in Long Island City, NY. Delta is part of P. J. Mechanical Corp a mechanical contractor founded in 1971 and serving the greater New York City real estate market.

Jacob Pierides, Senior Project Manager for Delta Sheet Metal, commented that the installation was different from the typical spiral projects.

The overall size of the facility measures 260’ by 215’ and consists of three levels. The tipping floor approximately 26’ above the pier is where the large trash trucks enter and unload their waste. The waste falls to the loading section 10’ below where heavy equipment collects and tamps the trash into compact bundles. These trash bundles are then loaded onto barges 16’ lower at the pier level where they are taken for eventual burial.

The facility requires constant ventilation due to the refuse odor and exhaust gases from the trucks. Because of the volume of ventilation required, the facility has 28 fans with 18 located in the mezzanine level. These 18 fans are all connected to the spiral ducting with runs along the station ceiling.

In all, approximately 3,800 linear feet of stainless spiral ducting was installed at the transfer station in a variety of sizes from 10” to 62” with 1,400 feet sized at 52”. Over 1,200 stainless steel Spiralmate connectors of all sizes were used to attach the ducting.

The highest point in the trash facility is 62’, making the installation rather treacherous at times! For ductwork 42” or less in diameter, Pierides said the sections were manufactured 10’ lengths. Ductwork above 42” in diameter was manufactured in 5’ long sections. All sections were assembled piece by piece in the air.

“Spiralmate made it easier to connect spiral ductwork 60 feet up in the air,” mentioned Pierides. “The one bolt closure band accelerates installation time in the field compared to bolting the flanges together. Using Spiralmate connections helped with the production and quality of the spiral ductwork installation.”

He said that by using Spiralmate connections they did not have to add any additional stiffeners to the duct. That made production in the shop and installation in the field more efficient. It also made it safer by reducing the possibility of a section accidently coming loose while workers were in the air.

Pierides also concluded the Spiralmate duct connectors helped the spiral ducting maintain its shape. Using Spiralmate connections made the installation of the spiral ducts on this project possible. It allowed for the spiral duct to maintain its shape after installation by adding rigidity to the overall structural product.