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Old 08-13-2020, 04:16 PM   #1
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Silly air filter question


I dunno why, but I never thought about this until I changed the AF in my heat pump today.

Should the pleats in the air filter be lined up parallel to or perpendicular to the orientation of the grill? I thought about it for a minute and I could make an argument for either way.

The filter is 20x20 square, so the answer is not automatically obvious as if it were rectangular.

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Last edited by ZZZZZ; 08-13-2020 at 04:21 PM.
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Old 08-13-2020, 06:13 PM   #2
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Re: Silly air filter question


doesn't matter, air flows through all the material, the pleats are just there to increase surface area.
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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 08-13-2020, 06:33 PM   #3
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Re: Silly air filter question


Air doesn't much care for changing flow direction. With the louvers and pleated filter it changes direction 3 times in a very short distance so it probably doesn't matter.
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Old 08-13-2020, 06:35 PM   #4
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Re: Silly air filter question


the air flows through the material evenly, the pleats don't really change the air direction.
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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 08-13-2020, 07:30 PM   #5
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Re: Silly air filter question


Quote:
Originally Posted by user_12345a View Post
the air flows through the material evenly, the pleats don't really change the air direction.
I'm betten the bottom of the V plugs first because that's a straight shot after the louvers, so then what choice does that leave for the air but turn a corner to the left or right then back to a straight shot again.
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Old 08-13-2020, 07:37 PM   #6
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Re: Silly air filter question


The only thing you have to pay attention to is the little arrow printed on the filter frame indicating the flow direction.
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