For the baseline fan power limitation, the pressure drop allowances are defined. I am a bit fuzzy on the definition of "Return/Exhaust Control Devices". A system with a return fan and OA economizer typically has dampers to control the flow of the OA, return/exhaust air streams. Would these dampers qualify as a Return/Exhaust Control Device?

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Christopher Jones, P.Eng.
Senior Engineer

WSP Canada Inc.
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