Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Dampers - Rectangular Industrial Dampers: Model:H-620 Heavy Duty, Flanged, All Steel, up to 20" w.g. APPLICATION The Model H-620 is a heavy duty flanged frame style industrial control damper. It has 10 gauge galvanized symetrically designed blades. H-620 DOCUMENTS - Submittal Sheet - Face and Bypass Details - H-620 CAD Details - H-620,621 BIM (REVIT) - Bearing Chart 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