DAYTON 3AZK2 Roof Curb Adapter,Curb Side Sq O D 18 In
$305.99
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...