Dayton Roof Curb: Fixed Ventilated Curbs, Square Curb, 21 x 21 in Inside Dim 4HX56 - 1 Each
$684.41
Roof Curb, For Fan Base Size 26 in, Curb Height 24 in, Curb Inside Width 21 in, Curb Outside Width 24 1/2 in, Material Steel, Standards NFPA 96, UL 705, UL 762, For Use With NFPA 96, UL 705, UL 762, Adjustability Fixed, Ventilation Type Ventilated,…