Builder's Best WMF621 Foil Duct UL181

• 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

PRODUCT SPECIFICATIONS

• Wire helix duct with steel wire support
• Multi-ply design of aluminum/polyester laminate and metalized polyester
• PRO Performance LevelUL® 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