Square Fire/Smoke Damper, 7-3/4 In. H, DAYTON, Mfr# 3HGJ3

7.75 In.H 21 In.L 8 In.W Motrzd Fire/Smoke Damper, For Nominal Duct Diameter Not Applicable, Damper Application Fire and Smoke, Number of Panels 1, Overall Height 7 3/4 in, Overall Length 21 in, Rough Opening Shape Square, For Duct Shape Square, Overall Width 8 in, Frame Material Thickness 16 ga, Blade Material Galvanized Steel, Maximum Air Pressure 4 in wg, Overall Diameter Not Applicable, Rough Opening Width 8 in, Damper Type Dynamic, Maximum Air Velocity 2000 fpm, Nameplate Voltage 24V DC