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 MultiBlade 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. These Multi-Blade dampers are available in 74 stock sizes with a 24-volt spring return “Mid-Torque” motor or a Power Open/Power Closed motor. An optional Spring Return High Torque motor is also available.

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DuroZone round dampers are made of galvanized steel with reinforcing beads for maximum durability and are crimped on one end for easy installation. Round dampers are available with different motor options: Power Open/Power Close, Mid Torque Spring Open/Power Close and High Torque Spring Open/Power Close. The single blade design insures smooth operation and efficient sealing for maximum control of air flow. The round housing is suitable for use with flexible ducting or round sheet metal duct.

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Since each damper of this series is adjustable, the eight different sizes available will adjust to 30 of the most common duct size requirements. This, coupled with an extruded aluminum frame and formed aluminum blade (combining minimum weight with maximum strength) defines a damper of unsurpassed durability and versatility. Each damper easily adjusts to a minimum of three different sizes and includes a mid-torque motor that ensures reliable trouble free operation.

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Retro Fit

DuroZone Retro Fit Dampers can be used to add a zoning system to existing 6'' round ductwork without the need to section, take down or redesign existing ductwork. Retro Fit Dampers feature a high strength molded mounting plate with gasketing as well as a blade with an integral blade seal to further minimize or eliminate leakage. DuroZone Retro Fit dampers are powered by a 24 volt spring open/power closed motor and can be linked together for tandem operation.

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Pressure Relief Dampers

Available in Rectangular and Round

DuroZone Pressure Relief Dampers are used to relieve excess air pressure created when less than all the zones of a duct system are calling. They do this in a simple and reliable fashion based on barometric/static pressure in the duct system. When pressure builds up in the duct system due to satisfied zones, the pressure opens the damper blade and “bypasses” to an unconditioned area or back to the return air duct. The pressure relief damper closes when the system is off or when all the zones are calling. DuroZone Pressure Relief Dampers are available in both rectangular and round configurations.

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