The BAYDMPR321A is a manual outside air damper designed for 3-5 ton packaged rooftop units. It allows for manual control of the outside air intake, providing an adjustable airflow range of 0 to 50%. This damper is ideal for applications that require outside air ventilation to maintain indoor air quality or meet ventilation requirements. Constructed from durable materials, the BAYDMPR321A ensures long-term reliability and is compatible with a wide range of commercial HVAC systems, such as T/Y/WSC models. It’s an effective solution for adding manual ventilation control to your HVAC system.