UPC # is an insulated UL , Class 1 Air Duct which meets the requirements ATCO # and # are used as supply, return, and exhaust ducts in low. PDF/3. Perforated Supply Diffusers. 6. PDC. Perforated Supply Diffusers ( Individual Adj. Single Duct Terminal Unit (Bare Box) Flexible Duct & Sheet Metal Fittings ATCO. Economical Flexible Duct. Barnebey Sutcliffe. Carbon Filtration. Laboratories in accordance with ADC Flexible Duct Performance and Installation Standard ATCO #, #, and # are UL , Class 1 Air Ducts and are. ATCO #, , and are UL , Class 1 Air Ducts and are ATCO # and have increased insulation for superior thermal performance. All thermal performance (R-Values) are classified by Underwriters Laboratories in accordance with ADC Flexible Duct Performance and Installation Standard. FLEXIBLE DUCT. ATCO-GARY METAL TECHNOLOGIES. Our premium insulated duct has a double ply, metalized polyester vapor barrier with tri- directional. High quality uninsulated aluminum foil flexible air duct for use in commercial HVAC systems. Provides easy and fast installation with round or oval connections. Fully flexible, pre-insulated ducting with an inner core constructed from multiple layers of aluminized polyester laminated to encapsulate a high carbon, spring. Black or white flexible closed-cell elastomeric thermal insulation in a tubular form Atco warrants that all flexible ducts will be free from. Easy Flex Duct. The insulated Flexible Duct, constructed of a tough allumunium inner - core ATCO FLEXDUCT PRIVATE LIMITED. , Noida Special.