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 Balancing / Regulating Dampers UV Products Iris Dampers Drop Plenum Diffusers 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