you need to have more exhaust then intake for negative pressure. if you have it set up right then u you would be sucking in all the air thru the gaps and pulling out your smelly air.. if you have an intake or to much intake then you are not letting your exhaust work properly and its not pulling out all the air it should your pushing air out thru those gaps... either cover up your intake holes or just let them stay open and it will suck air thru there..... good luck

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