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Old 08-13-19, 04:45 PM   #57
Apprentice EcoRenovator
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Originally Posted by jeff5may View Post
One of the worst things you can do to destroy performance is to put in a filtrete filter in the spot that the factory one came out of. They drop way more pressure than they should and starve the air handler. Everything wears out faster when it runs 30 to 60 percent longer cycles to satisfy the comfort load.
I can attest to that fact. I put the largest filter/grill assembly I could find in the return air duct at my mom's house. I figured twice the area would allow me to use the best Filtrete on the shelf.

It created so much pressure drop the 18" round, heavy gage steel return air duct collapsed. And that was on a 1.5 ton unit. I doubt if four times the original filter surface area would have been enough.
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