Products Architectural Louvers, Dampers, Roof Curbs, Actuators, Grilles, Sunshades and more. Dampers - Round Dampers: Model:R-PB Round Multi-Blade Damper APPLICATION The Model R-PB multi-blade damper was developed to maintain a more even airflow through the duct system. R-PB DOCUMENTS - Submittal Sheet - B-8 PERFORMANCE DATA - R-PB BIM (REVIT) - 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