Blast Gate For Nominal Duct Diameter 6 in Body Material Grade Type 1 Body Material PVC Overall Length 6 3/8 in Product Type Manual Blast Gate Blade Material PVC Maximum Temperature Rating 140 Degrees F Seal Material Not Applicable Standards Cell Class 12454 ASTM D1784 Inside Diameter 6 5/8 in Color Gray Air Inlet Size 6 5/8 in