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Cannot Find where air filter is?

I recently bought a one level ranch home built in 1988. I want to change the air filter which seems like it would be located under the house where the HVAC unit is located, but I cannot find where the filter is on the unit? When I recently went under the house, I checked out where this may be and was suprised to see a filter laying next to the unit! From where I could reach, I could not find where this could have come from? To describe the unit, it is a grey box about 6' long x 2' wide. There are 3 ducts coming off it as well. I cannot see a product id #, model name/#, etc. Does someone have an idea of where this filter came from?????

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You are looking for a thin cover that is held on with 1 or 2 screws.
(The one pictured in the circle,Yours may be located in the middle or opposite end)

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Posted on Feb 09, 2009

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