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The RRD7 by Honeywell is a round damper that is easily inserted into rigid round ducts for retrofit zoning in forced air heating and cooling systems used in 7 in. ducts. The damper is used with Honeywell Emm-3, Emm-3u, Tz-4, W8835 and similar zone control systems. The power open, power closed actuator draws 2.5 VA allowing multiple dampers per zone, but delivers high torque for reliable operation.



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