Builder's Best UL 181 Flexible Foil Ventilation Duct, 4" x 8', Aluminum/polyester
$19.99
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This wire helix product features steel wire support with a multi-ply design of metalized polyester and aluminum/polyester laminate. It is UL® 181 listed and labeled as a Class 1 Air Connector. UL® 181, Class 1 air connector labelMulti-ply design of metalized polyester and aluminum/polyester laminateSteel wire support3″ dia. has ¾” pitch4–12″ dia. has 1″ pitchUL® sticker every 10 feetMaximum velocity rating 5000 fpm
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