Underground Duct Advantages, Description & Installation of Underground Duct System Printer Friendly Page Underground Duct PVS (Polyvinyl Steel) coated underground HVAC duct (also known as PCD, PVC coated, and PVCS) is UL listed and specified more often by architects, engineers, and contractors t...

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Sealants & Tapes Duct Sealant & Aluminum Foil Tape 601 Duct Sealant Premium Indoor/Outdoor Flexible Water Based Duct Sealant Specifications Compliance: Passes ASTM C-731, ASTM D-2202. USDA, EPA and FDA Approved. A versatile, all purpose, fiber-free, duct sealant for use on all types of metal...