Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Drop Plenum Diffusers - Drop Plenum Diffusers: Model:AFPD Angled Face Drop Diffuser/Plenum APPLICATION The model AFPD is a drop diffuser plenum that offers angled double deflection grilles. This model can be custom built up to 100,000 cfm. AFPD DOCUMENTS - Submittal Sheet - AFPD BIM (REVIT) - AFPD submittal (discontinued) 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