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Discussion Starter · #1 ·
I have a forced air furnace that is located in the crawl space--which makes it difficult to access the furnace for routine furnace filter changes. Can I install a furnace filter slot upstream so the filter can be more easily changed via the cold air return vent?
 

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Discussion Starter · #3 ·
Thanks for the response--that was my logic, it's the same air. Since you mention the one downstream I assume you mean sealing the access door to the former filter location. I would not be using 2 filters, correct?
 

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That's where I like to put them... keeps the ducts cleaner.
 

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It should be upstream of the furnace, it’s function is to keep the furnace clean. If you have one return vent, it is ok to have it behind that vent.
 

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if your return duct is not perfectly sealed, it's a bad idea.
 
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