Butterfly Damper For Nominal Duct Diameter 12 in Inlet Diameter 12 in Overall Length 14 1/2 in Product Type Butterfly Valve Weight 7.5 lb Maximum Pressure Rating 10 in wc Maximum Temperature Rating 140 Degrees F Material PVC Seal Material Not Applicable Minimum Pressure Rating Not Applicable Standards ASTM D1784 Cell Class 12454 Shape Round Inside Diameter Not Applicable Outlet Diameter 12 in Overall Height 14 1/2 in Overall Width 15 1/4 in Color Dark Gray For Duct Shape Round