Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Louvers - Fixed Louvers: Model:D-HFA-4 High Performance 4" Fixed Louver APPLICATION D-HFA-4 resists water intrusion while providing an extremely high free area and low pressure drop. D-HFA-4 DOCUMENTS - Submittal Sheet - D-HFA-4 Cad Details - D-HFA-4 (BIM) Revit 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