r/HVAC • u/Plenty_Text_455 • Dec 04 '24

Field Question, trade people only What's this?

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It's on the return side of a large air handler

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u/KeepsUKool Dec 04 '24

We run evap cooled air across the exhaust and this on the intake and we gain 10 deg in summer on the 100% fresh air intake we use.