I usually have 1" thick filters in the outer slots and nothing in the airbox slot itself. This worked well for coarse pet hair, dust and the like. But when my wife's daughter came to us with a cat allergy. We did pulled out the other filters and put this one in the main slot instead. I almost want to say it's like putting an N95 mask on your house. this filter works. Without it she would have red eyes and stuff. with it. She's been here for a week with no problems.
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