Builder's Best WMF621 Foil Duct UL181 Phosphate Remover and rust resistant for indoor

and rust resistant for indoor or outdoor use

unzip and cut an opening with a box knife

CE Certified

7/8" & 1" drive-in

3-conductor SJTW

Builder's Best WMF621 Foil Duct UL181 Phosphate Remover and rust resistant for indoorWire helix multi ply foil duct designed for low to medium operating pressures in HVAC systems Class 1 Air Connector label meeting NFPA (90A and 90B). Tear and Puncture Resistant Encapsulated wire helix does not unravel when cut to length Air tight construction and smooth inner core Steel Wire Support Note: Not for use to vent appliances for cooking, heating, and clothes drying unless approved and recommended by the appliance manufacturer PRODUCT