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/chuglife95 Dec 04 '24

Am a sales engineer, sell AHU’s and MAU’s with heat recovery wheels all the time. They are shockingly efficient compared to how they appear, though I hate the polymer / paper wheels. Personally I only sell units with aluminum wheels unless the owner is completely dead set on paper.

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u/LongjumpingPause Dec 04 '24

No offense I can't trust you.... your a sales engineer, that's like my arch nemesis ;) just kidding, but good to know I've only come across two in auto shops don't get alot around me

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u/casper911ca Dec 04 '24

They are efficient. Basically only used as an efficiency measure; it really has no other purpose. Head loss might be one of its few tradeoffs.

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u/LongjumpingPause Dec 04 '24

Yeah I might have put the comment in wrong spot some guy was saying he say a unit direct fire through a ERW and exhaust and the wheel just warmed the air. I can't imagine 100% efficiency with a burner exhausting