The 24v Automatic Round Damper (Normally Open) 20" from METROPAC INDUSTRIES INC is designed for efficient airflow control in HVAC systems. This damper features a durable construction with a 20" diameter, ensuring reliable operation in various applications. It operates at 24V, making it suitable for integration into standard HVAC systems. The normally open design allows for automatic airflow regulation, enhancing system efficiency. This damper is compliant with industry standards, making it a trusted choice for HVAC professionals seeking reliable airflow management.