Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Dampers - Round Industrial Dampers: Model:HD-492-ISO Industrial Isolation Damper APPLICATION The Model HD-492-ISO is a heavy duty round isolation damper with a flanged style frame. It is designed to control airflow and provide shut off in HVAC or industrial process control systems. HD-492-ISO DOCUMENTS - Submittal Sheet - HD-492-ISO BIM (REVIT) - Bearing Chart - Actuator Sizing Chart Drop Plenum Diffusers Balancing / Regulating Dampers UV Products Iris 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