Whether you are installing rectangular phenolic or our InspiralR and Floval Systems, these systems all offer a clean look with a paintable exterior that can easily blend into ceilings. These systems also offer many benefits of phenolic systems, including higher R-values, lower air leakage and upwards of a 70% reduction in weight.
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With InspiralR and Floval, contractors get the best of both worlds: efficient airflow and airtight construction with an architectural finish built for open-ceiling environments. Whether you’re working on a modern office, school renovation, or mixed-use space, Thermaduct’s exposed ductwork solutions deliver performance, appearance, and reliability... all in one system!
Using professional grade water based, acrylic paints that can adhere to an aluminum surface have produced exceptional results and give this R-6 ductwork as clean of a look as any other exposed duct system. Once installed, you won't even know the difference until you look at your utility cost!
Often times indoor applications have ductwork installed in clear view for building occupants. In some instances this is a design choice, looking to include ductwork into the architectural vision of the building, and others because of a necessity due to space restrictions. While traditional metal options are often associated with an industrial style look, once insulation is required options begin to change. Providing thermal resistance to your ductwork can be done in a variety of ways, each with their own pros and cons.
Phenolic duct systems are an excellent option for any interior installation that requires insulated ductwork to be manufactured. These SMACNA compliant systems are able to provide a minimum R-6 installed value free of loose interior fibers, reduced air leakage, substantially reduced weight and a clean, smooth surface that can be painted in a variety of color options. Always discuss paint options with your engineer before putting into practice.
Installs Faster, With Smaller Crews
InspiralR and Floval are designed to move quickly on site. Pre-insulated and delivered in long sections, they come ready to hang with no field wrapping or separate insulation required. With lightweight panels and simple connection methods, crews can install duct in tight ceilings and crawlspaces without fighting rigid metal sections or custom transitions.
Because most sections are designed and cut before delivery, teams can skip the layout guesswork and move straight to setting duct. Whether you’re working overhead or across finished spaces, fewer moving parts means fewer delays.
Easier on Crews, Especially Overhead
Anyone who's hauled 24" duct overhead knows what it does to your back. Floval and InspiralR systems are built from phenolic insulation—making them a fraction of the weight (over 70% lighter) of traditional metal duct with external wrap. That means easier lifts, safer handling, and less strain on your crew day to day.
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The lightweight design also eliminates the need for oversized supports or trapeze hangers. Systems can hang cleanly with minimal supports, making them ideal for ceiling installs or long corridor runs where overhead clearance is tight.
No Special Tools, No Extra Trades
InspiralR and Floval can be installed using common hand tools—no sheet metal brakes, no pin spotters, and no field-fabricated insulation. Everything needed for assembly is included: flanges, sealants, gaskets, or adhesives depending on the system.
For project managers and foremen, this means less dependency on specialized labor. Crews familiar with duct installation can assemble phenolic systems with minimal training (we have a brief online training video) or adding insulators to the job. It’s ductwork—just streamlined.
Sealed from the Start
InspiralR and Floval are designed to meet or exceed SMACNA phenolic duct construction standards, including low-leakage performance for both pressure and return systems. With tight seals at the flanged joints and no exposed liner to fail, airflow stays where it belongs.
That means fewer adjustments during balancing, more predictable system performance, and peace of mind knowing you won’t need to revisit joints that fail under pressure testing.
Ideal for Finished Interiors and Space-Constrained Projects
Floval’s flat oval design is ideal for corridors, drop ceilings, or tight plenum spaces where rectangular duct doesn’t fit and spiral might hang too low. InspiralR is well suited for straight runs and vertical drops that benefit from a round form with cleaner airflow.
Both systems are built for low-profile installs—pre-insulated, clean-looking, and field paintable for retrofits, schools, hospitals, and interior renovations. No wrap, no mess, and less disruption to building occupants.