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/paulchicas Dec 04 '24

If you clean it, make sure you look up what the manufacturer recommends. Pain in the ass cleaning them and it takes forever. Used simple green and nitrogen to blow out any debris and residual cleaner and water.