DuroZone Pressure Relief Dampers are used to relieve excess air pressure created when less than all the zones of a duct system are calling. They do this in a  simple  and  reliable  fashion  based  on  barometric/static  pressure  in  the  duct  system. When pressure builds up in the duct system due to satisfied zones, the pressure  opens  the  damper  blade  and  “bypasses”  to  an  unconditioned  area  or  back to the return air duct. The pressure relief damper closes when the system is off or when all the zones are calling.

Rectangular barometric relief dampers have a single blade design with an adjustable weighed arm to regulate static pressure. Like a motorized rectangular damper, these barometric dampers are of open frame design and are made to install inside a section of rectangular duct. Vertical mounting is suggested.

Application: Residential and light commercial low pressure duct systems.