4" x 25-ft Un-Insulated Flex Duct
Item CodeFDU04SKU110202
Brand Builders Best® Diameter 4 in Manufacturer Builder's Best, Inc. Type Uninsulated Color Silver Length 25 ft Model WMF621 - Wire 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
- Wire helix duct with steel wire support
- Multi-ply design of aluminum/polyester laminate and metalized polyester
- PRO Performance Level
- UL® 181, Class 1 air connector label; UL® sticker every 10 feet
- 3" dia. has ¾" pitch; 4–12" dia. has 1" pitch
- Maximum velocity rating 5000 fpm
$47.89
/ EAIn Stock
Request a quote for more detailed pricing including freight and taxes.
Brand Builders Best® Diameter 4 in Manufacturer Builder's Best, Inc. Type Uninsulated Color Silver Length 25 ft Model WMF621 - Wire 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
- Wire helix duct with steel wire support
- Multi-ply design of aluminum/polyester laminate and metalized polyester
- PRO Performance Level
- UL® 181, Class 1 air connector label; UL® sticker every 10 feet
- 3" dia. has ¾" pitch; 4–12" dia. has 1" pitch
- Maximum velocity rating 5000 fpm