• No weights to balance Easy flex duct installation Simple dial for setting when the system starts to bypass Can be installed at any orientation or angle Allows more airflow than typical weighted models, so you can install a smaller size Provides constant system pressure, regardless of zone changes or blower speed Calibrated spring tension regulator

The TrueZone® bypass constant pressure regulating damper (CPRD) is a round static pressure relief damper. It is used in forced air bypass applications to relieve excess static pressure when some of the zone dampers are closed. The damper is installed in a duct that delivers air to the return or a dump zone. The damper automatically opens and closes to maintain a desired static pressure. The CPRD uses a calibrated spring to regulate the bypass air accurately when any number or combination of zones is calling. Conventional, weighted arm, bypass dampers may operate properly when one zone is calling, however, when different combinations of zones are calling, they bypass too much or too little. This can cause callbacks when homeowners complain of air noise.