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Builder's Best WMF621 Foil Duct

Builders Best

SKU: 17316308

  • 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

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