Marv, if your worried about return air I would suggest that you take off the grills and affix some cheese cloth to the back of them then replace. This will not hamper your air flow and allow you to rest easy about the filter problem.
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2007 42' Friendship Quattro
2007 Liberty Toad
No Rodents
Kids raised and only barrow money
400 Cummins Bad Milage
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