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Old 06-10-2012, 04:05 PM   #1
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2 filters? 20x25x4 + 20x25x1

My furnace requires a 20x25x5 filter, however had someone out to clean it and they charged me for a 20x25x5 but used a 20x25x4!

I called to complain and they dropped off a 20x25x1 filter to "double up" an said this is just fine. I cant really read anything online if this will work but seems to be more cost effective as the 4 inch filter is to be replaced each year while the 1 inch is every three month, but the 1inch is $14 online compared to $70 for the larger one.

Think this will be ok to do? Otherwise I have to have them come out and their 5inch filter is $26 more and don't really want to pay and wait two weeks.


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Old 06-10-2012, 04:33 PM   #2
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The very thick ones usually have different stages, so you're probably fine. For the 1 inch you can probably get away with a cheapy one to capture the bigger stuff. Though if you get a slightly more expensive one it should make the 4 inch one last longer provided you place it first. That's what I would do. See what the hvac pros say though...


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Old 06-10-2012, 05:50 PM   #3
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Those are nominal dimensions and there is no REAL difference between a 4" and 5" filter. You should not use 2 filters especially if the 1" is pleated. A fiberglass 1" would be fine though.
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Old 06-10-2012, 07:33 PM   #4
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For that kind of money you should maybe get a plastic manometer and use it to tell when the filter needs replacing rather than following a one-size-fits-all schedule.
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Old 06-10-2012, 09:44 PM   #5
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Pull the one inch out and just use the 4". Two filters can really mess with air flow.
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