Roof Curb Adapter,Curb Side Sq O D 18 In

Description

Roof Curb Adapter, Adapter Type Reducer, For Fan Base Size 21 1/2 in, For Curb Size 18 in, Material Steel, For Fan Type Downblast Fans, Filtered Supply Fans, Upblast Fans, Curb Side Width 18 in, Fan Side Width 21 1/2 in, Finish Galvanized, Function Adapts 22 in Fan Base to Fit 18 in Roof Curb, Includes (8) 1/4-20 Tinnerman Speed Nut, (8) 1/4-20 x 3/4 Bolts, Metal Material Thickness 18 ga, Number of Fasteners per side 2, Overall Height 5 in, Top Flange Height 2 1/2 in