90* Angle Boot with Extension, Fire Damper, and Flange

Fire dampers are typically required when a duct passes a fire rated barrier (walls, partitions, or floors). Uses a heat fusible link that, when activated, closes and impedes the migration of high temperature into and through the duct system. Equivalent length supply or return 20'.
Sizes 8" x 4" x 4" - 5"; available 12 per box.
Sizes 10" x 4" x 4" - 6", 10" x 6" x 4" - 6"; available 12 per box.
Sizes 10" x 4" x 7", 10" x 6" x 7" - 8"; packed to order.
Sizes 12" x 4" x 6", 12" x 6" x 6" - 8"; available 8 per box.
Sizes 12" x 4" x 8", 12" x 12" x 8"; packed to order.
Sizes 14" x 6" x 8" - 9"; available 6 per box.