• Multi-blade dampers are placed inside ductwork to control airflow in warm air and air-conditioning systems The exterior side-mounted linkage ensures quiet operation and a smooth in-duct airflow Parallel blade operation with heavy neoprene blend on top and bottom for a tight rattle-free seal Gasketing included for high-integrity seal 4-1/16 x 1/2 in frame 2-3/4 x 3/32 in extruded aluminum blade 3/4 x 1/2 in vinyl nitrile gasket Nylon bushings of 5/8 in OD with a 3/8 in square hole All blade linkage is 16 ga galvanized steel

The DuroZone® multi-blade damper for residential zoning systems has been engineered to include many features. Ribbed for strength and extruded from lightweight aluminum, the sleek frame profile provides maximum strength without excessive reduction of free-area inside the ductwork. The extruded aluminum blades are mounted with friction minimizing nylon bushings to provide easy transition between opening and closing. The DuroZone® spring return multi-blade dampers also feature damper blades designed to remain within the damper frame for easy insertion and an external side-mounted linkage for smooth and quiet operation. Multi-blade dampers with a 24 V spring return mid torque motor.