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Air Balance Equations

SA=RA + OA= RA + EA + RFA

Where,

* SA = Supply Air
* RA = Return Air
* OA = Outside Air
* EA = Exhaust Air
* RFA = Relief Air

If minimum outdoor air (ventilation air) is greater than exhaust air, then the space will be positive pressurized and OA = EA + RFA

If exhaust air greater than minimum outdoor air (ventilation air), then the space will be under negative pressure and OA = EA; RFA=0

For Economizer Cycle

OA = SA = EA + RFA; RA=0
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