Mixed Air Calculator

Outdoor air temp (°F)

Return air temp (°F)

OA damper (%, 100 = fully open)

RA damper (%, 0 = fully open)

Mixed air

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°F

OA fraction

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%

RA open

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%

RA_open = 100 − RA% · OA_frac = OA% / (OA% + RA_open) · T_ma = OA_frac·T_oa + (1 − OA_frac)·T_ra

Example: 80°F OA · 72°F RA · OA 50% · RA 50% → 76°F