Remove duct filter if using HEPA?

Old 06-21-08, 12:22 PM
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Join Date: Jan 2004
Location: Sugar Land, TX
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Remove duct filter if using HEPA?

Should I remove the filter behind the return air grills if my unit has a 4" hepa filter filter at the attic unit? I downgraded the grill filter to cheapest quality with three thoughts in mind. First, it would extend the life of the $25 hepa. I change the cheapies quarterly. Second to keep the return air ducts clean. Third having 2 cats and a dog, capture the big stuff first. Am I significantly hindering performance/airflow? Should the grill filters be removed?
Old 06-21-08, 06:58 PM
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If this is a true HEPA which I don't think it is for 25 bucks, It will have to be a bypass filter. Bypass is where the filter will have it's own motor to pull air into the filter and then out to the unit. A HEPA can not be the only filter on a residential unit. It will not allow enough airflow to the unit and will stave it for air. I bet you have a 4in media filter. And only way id use the throe away filter is if duct work and unit where designed to have it in place.

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