36
Free Bypass Damper
This type of bypass damper releases the surplus static air pressure into the conditioned
air space. The location of this component is parallel to the supply air direction and next to
the air handler or furnace as shown in the following figures.
Fig. 13 - Correct placement of the Bypass Damper
Fig. 14 – Incorrect placement of the Bypass Damper
Fig. 15 – Correct connection of the bypass duct to the
return duct
Fig. 16 - Incorrect connection of the bypass duct to the
return duct
Airzone has two types of free release bypass dampers: rectangular and circular (the latter is
characterized by the fact that it can be used in both free release or ducted bypass dampers.
Traditionally, the rectangular bypass damper is installed in rectangular fiber ducts or sheet
metal ducts while the circular bypass damper is usually installed in plenums with flexible ducts.
A circular bypass damper installed in a plenum must meet the same application guidelines as a
rectangular bypass damper.
Fig. 17 – Rectangular Full-Return Bypass Damper
Fig. 18 – Circular Bypass Damper
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