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Which way does the filter face?

I have central air, an old rooftop unit circa 1982. It's BDP (Carrier) model 585CJ030050. I just moved into this condo, and there is no documentation or information about this unit other than the model number on the unit itself. Thanks to a helpful gentleman here on FixYa, I was finally able to locate the filter, which slides out from between the unit and an air duct.

This is where my current question comes in! The old filter was a weird, bidirectional-looking thing. The replacement I bought is pleated, and has to face a certain direction relative to the airflow. But which way does the air flow? My theory is that the air is hitting the filter on its way INTO the unit from an intake inside the house. My wife's theory is that the air is hitting the filter on its way OUT of the unit as it blows into the house.

Which way makes sense? Or are we both nuts? (Well, we are, but that's beside the point!)

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You guys are not nuts. It is hard enough just to get people to change the filters in the first place:) You are right. The filter is filtering the air as it goes into the unit. The little arrow on the filter should point at the unit (away from the duct). Good Luck!

Posted on Jun 18, 2008

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