• Rigid barrel won't bend out of shape
• Fast installation

HVAC systems with 3 or more zones should be equipped with a pressure relief bypass duct to prevent over pressure buildup that may damage the system. This duct is installed just ahead of the blower. It opens and redirects some of the airflow back into the blower intake when pressure builds up due to many dampers being closed. This mechanical bypass duct, constructed of Galvanized Sheet Metal, is continuously variable, and the pressure relief level is easily adjustable.

Due to excessive weight, Smarthome will add a heavy-item shipping charge to this item. This charge will be reflected in the shipping amount on the check-out page.

12 Inch Diameter Barometric Pressure Relief Bypass Duct

8 Inch Diameter Barometric Pressure Relief Bypass Duct	10 Inch Diameter Barometric Pressure Relief Bypass Duct

10-Inch Diameter Normally Open Electronic HVAC Air Duct Damper with Power Supply	8-Inch Diameter Normally Open Electronic HVAC Air Duct Damper with Power Supply	6-Inch Diameter Normally Open Electronic HVAC Air Duct Damper with Power Supply	4-Zone Controller With Thermal Equalizer (For Standard And Heat Pump Systems)