Square Fire/Smoke Damper, 17-3/4 In. W, DAYTON, Mfr# 3HGK4

17.75 In.H 16 In.L 18 In.W GStl Fire/Smke Dampr, For Nominal Duct Diameter Not Applicable, Damper Application Fire and Smoke, Number of Panels 1, Overall Height 17 3/4 in, Overall Length 16 in, Rough Opening Shape Square, For Duct Shape Square, Overall Width 18 in, Frame Material Thickness 16 ga, Blade Material Galvanized Steel, Maximum Air Pressure 4 in wg, Overall Diameter Not Applicable, Rough Opening Width 18 in, Damper Type Dynamic, Maximum Air Velocity 2000 fpm, Nameplate Voltage 120V AC