Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. DampersBackdraft DampersBlast DampersRectangular DampersRectangular Industrial DampersH-420 - Heavy Duty, Flanged, All Steel, up to 10" w.g.AH-620 - Opposed Blade, Heavy Duty, Flanged, Steel Frame, Aluminum Airfoil Blades, up to 13" w.g.H-620 - Heavy Duty, Flanged, All Steel, up to 20" w.g.NAH-720-1 - Opposed Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 20" w.g.NAH-720-2 - Opposed Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 30" w.g.NAH-720-3 - Opposed Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 35" w.g.NAH-720-4 - Opposed Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 40" w.g.AH-621 - Parallel Blade, Heavy Duty, Flanged, Steel Frame, Aluminum Airfoil Blades, up to 13" w.g.NAH-721-1 - Parallel Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 20" w.g.NAH-721-2 - Parallel Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 30" w.g.NAH-721-3 - Parallel Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 35" w.g.NAH-721-4 - Parallel Blade, Heavy Duty, Flanged, All Steel, Airfoil Blades, up to 40" w.g.Jackshafting - Rectangular Industrial DampersMaintenance - Rectangular Industrial DampersRound DampersRound Industrial DampersSmall Motorized Rectangular DampersSmall Motorized Round Dampers UV Products Iris Dampers Drop Plenum Diffusers Balancing / Regulating Dampers Louvers Dampers UL Listed Dampers Roof Curbs and Rails Sunshades Architectural Grilles Ventilators Doors Actuators Fans Air Measuring Products VAV Terminals Security Bars & Grilles Plenums Duct Take-Offs Custom Work Manufacturer Cross Referencing System View Now Previous Next