Back Draft Dampers

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Back Draft dampers are commonly installed in fan exhaust systems to prevent a back draft of outside air when the fan is off. The damper is either a Spring Return type for both horizontal and vertical mounting or Gravity Return used in vertical venting only. Air Pressure or "out draft" opens both types of Back Draft Dampers. These Dampers are of a flat split plate "butterfly" design. The Back Draft damper reduces energy loss and maintains pressurization of the area