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Specifications
Construction

Round: 18-gauge steel spiral shell, aluminum shaft, nylon bushings, blade seals, adjustable weights

Rectangular: 22-gauge zinc plated steel frame, single blade design, adjustable weights

Sizes

Round: 7" to 16"

Rectangular: 12" X 8" to 20" X 12"

ApplicationSystems with static pressure 0.02" to 0.75" WC

Barometric Bypass Dampers

The NH-BV and NH-BH barometric bypass dampers are used to automatically bypass excess air when increases in duct pressure occur due to closing of zone dampers. Various relief air control settings are accomplished by simple adjustment of the weight on on the arm. Barometric bypass dampers are recommended for systems up to .75" WC of static pressure. Available in round or rectangular.


  • Easy adjustment
  • Many sizes available
  • Installation flexibility
  • Reduces system noise
  • Round and rectangular
  • 5-year warranty