Thermaduct Goes Indoors with Round and Flat Oval Solutions

Give your round and flat oval ductwork the increased performance with Thermaduct’s Inspiral R and Floval Duct Systems. These patent pending systems provide the increased air distribution efficiency of round or flat oval ductwork packaged in a light weight and high quality closed cell phenolic insulation. There’s no need to insulate separately as all ductwork reaches an R-6 insulated value.



  • UL 181 Listed
  • Incredible Fire and Smoke Performance
  • Lightweight - Up to 70% Lighter than Metal
  • Passes the UL 181 Mold Growth Test
  • High R-Values
  • Low Air Leakage
  • Patent Pending Connection System for Easy Installation

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