Using A (slightly) Larger Furance Filter - HVAC - DIY Chatroom Home Improvement Forum

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Old 04-13-2012, 09:59 PM   #1
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using a (slightly) larger furance filter

Hey Guys,

Do you think it would matter if I used a 16x25x1 filter in a 16x24x1 furnace? It will obviously stick out about an inch but I can't seem to get the 3M 2200 or 3M 1900 filters in my size.

Either I use the 1500 16x24x1 or I get the 2200 16x25x1. I don't think it would really make a difference but want to check here first. I assume everything would still be captured (dust, odor, etc...)



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Old 04-13-2012, 11:02 PM   #2
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The only consequence is that most filter frames that stick out will allow air to be sucked into the return air plenum which can create a negative air pressure area close to the furnace burners of the furnace.
This can be a problem for natural draft or 80% furnaces with borderline venting. Some folks deal with this by using a wide strip of cheap painters tape to bridge the filter gap where the air is being sucked in. Just make sure that there is no way that the tape can be sucked into the furnace or it will cost you $$$.


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Old 04-13-2012, 11:04 PM   #3
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For one, stop using the 3m Filtrete filters, they are not needed. If someone has allergies, you really should be using something like the Aprilaire system, not a replacable over priced filter. All we use in my furnace, is a washable filter, that gets cleaned once a month, and does a better job than those 3m filters.
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