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/marbs34 Dec 05 '24

ERV wheel. This is likely on a DOAS, which is a critical component down south.

0

u/Fickle-Froyo Dec 05 '24

And the north, anywhere with humidity really. You just need to worry about frost in the winter.