Builder's Best WMF621 Foil Duct UL181 Size:4'' x 5' Caps are over-sized for more

Caps are over-sized for more protective coverage

Additional Uses/Markets

can be used in closed or ventilation position

Made Of Extruded Aluminum

Builder's Best WMF621 Foil Duct UL181 Size:4'' x 5' Caps are over-sized for moreWire 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