Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Dampers - Backdraft Dampers: Model:HCB-750 Heavy Duty Backdraft Damper APPLICATION The Model HCB-750 is a vertical or horizontal mounted backdraft damper that is designed to allow vertical or horizontal airflow and prevent reverse airflow. HCB-750 DOCUMENTS - Submittal Sheet - CAD Details - HCB-750 BIM (REVIT) 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