DAYTON 3AZK8 Roof Curb Adapter,Curb Side Sq O D 21 In
$300.99
Roof Curb Adapter, Adapter Type Increaser, For Fan Base Size 18 1/2 in, For Curb Size 21 in, Material Steel, For Fan Type Downblast Fans, Filtered Supply Fans, Upblast Fans, Curb Side Width 21 in, Fan Side Width 18 1/2 in, Finish Galvanized,...