The Round Barometric Bypass Damper is used to limit air pressure in a zoning installation while closed zones would otherwise overly restrict the airflow, allowing pressure to build. Air is taken from the supply plenum to relieve pressure buildup. The reason for limiting pressure is only to limit air noise to a level acceptable to the homeowner. If noise is never objectionable, the damper will never need to open and could be eliminated. However, since many factors influence air noise, it is good practice to install a bypass unless the designer is certain that it is not needed.
Warning: this product contains a chemical known to the State of California to cause cancer. P65Warnings.ca.gov
‡Ductless Stock Up and Save offer valid thru May 31, 2019 at participating CE locations. Account must be active and in good standing condition to qualify for terms. Excludes special pricing and all accessories. Special quotes, OEM parts & job pricing excluded. Not valid on previous purchases. Offer cannot be combined with other offers or programs. Management reserves the right to modify or end this promotion at any time without notice. Orders must be placed and taken delivery by May 31, 2019.