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 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