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) 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