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If it still looks like new after six months, even though it is the cheapest and most inefficient filter available, then something serious could be wrong. Ensure that the return ductwork is all securely attached (so no unfiltered air is bypassing filter altogether). And as another asked, does the fan run often? If little to no air is going through the ...


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When the furnace fan starts drawing air through the filter it will conform to the housing, the bend may flatten out under pressure also but normal paper filters do flex and seal. The end should be sealed with a “flap” of metal that snaps in or is screwed into place and that will help Chanel the air flow and pull the duct flat. If this is in a garage the open ...


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You'll find out that these AC filter are not built to exact measurements. I've seen the thickness vary by as much as 1/4". If this bothers you, get some weather stripping from your home store and shove it in between the filter and the metal holder. It will bend the filter enough to close that gap. Any stripping would need to be rated for air handlers.


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There should be an air filter holding frame there. It looks like someone tried to make one or they literally got the cheapest filter frame I have ever seen. These things should be a much thicker gauge and should firmly house the filter. The other issue is that this should be fully enclosed with a solid cover. There are a multitude of problems here, ...


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That is going to cause a bit of leakage depending on how tightly the filter gets sucked against the frame when the air handler is running. Usually there is a foam gasket there to help with sealing. But it's possible yours didn't have one or it was left off at installation. You may want to adjust this to help force all the air to go through the filter. As ...


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Those gaps are normal and don't usually cause a problem. When the furnace is running the air pressure forces the filter against the downstream face of the slot, effectively sealing the opening. Also, it's not critical that you have a complete seal. The air in your home isn't (or shouldn't be) particularly dusty. It's important that most of the dust gets ...


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