ZoneMaster Suncourt ZoneMaster Adjustable Damper 12" Normally Closed

Control Airflow in an HVAC System or Fresh Air Intake: Avoid moisture build-up and keep your home smelling fresh; Allow you to individually control the temperature of a room in your home; For general ventilation control use; 20 gauge blade closes against gasket for minimal leakage; Control your comfort and save significantly on energy use; Simple easy-to-wire, two wire installation