Builder's Best WMF621 Foil Duct UL181 Phosphate Remover Thumb-dial blade release makes blade

Thumb-dial blade release makes blade change easy

CE Certified

7/8" & 1" drive-in

unzip and cut an opening with a box knife

Helps to save energy year round

Builder's Best WMF621 Foil Duct UL181 Phosphate Remover Thumb-dial blade release makes bladeWire 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