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Old 02-24-2020, 08:54 PM   #1
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Filter on returns


Hello! I was wondering if anyone knows if I can put a filter in the return even if there is no holder? I have two units (upstairs/downstairs). They both have filters by the blowers but I've noticed the returns (2 upstairs/1 downstairs) are caked. Do I need to buy a holder or can I just put one in and rest it? Is it okay to do that?
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Old 02-24-2020, 09:24 PM   #2
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Re: Filter on returns


double filtering can really reduce airflow.
(it's not a good idea to get rid of filter at furnace and just filter at grills because most returns leak.)

if you must, use fiberglass only at the return grills to pre-filter the air.

you can buy fiberglass hammock media and cut it to size.
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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 02-24-2020, 11:03 PM   #3
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Re: Filter on returns


Why not just change out your return grille to > one that holds a filter? These come in many sizes. Two latches and it lifts right up.

As suggested, just use a light see through fiberglass filter and change often. I have used these and experienced very little air reduction, and it allowed me to leave the pleated filter in the unit.


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