|Rectangular Pressure Relief Dampers (DD Series)||
DuroZone Pressure Relief Dampers are used to relieve duct systems of pressure build up created as zones are satisfied and zone dampers travel to a closed position. The DuroZone Pressure Relief Dampers do this in a simple and reliable fashion; based on barometric/static pressure in the duct system.
A weighted arm is attached to a damper blade. This weight is set to keep the damper closed when the system is off or all zones are calling. 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.
DuroZone Pressure Relief Dampers are available in both rectangular and round configurations.
|Rectangular Pressure Relief Dampers|
|Item No.||Description and Dimensions (Width x Height)||Bypass @ 1200 fpm|
DD 12" x 8"
DD 18" x 8"
|35068||DD 20" x 10"||1600 CFM|
|35069||DD 20" x 12"||1900 CFM|
|Round Pressure Relief Dampers (DDRD Series)||
|Round Pressure Relief Dampers|
|Item No.||Description and Diameter (In Inches)||Bypass @ 1200 fpm|
|35070||DDRD- 8||400 CFM|