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  #430  
Old 11-11-20, 21:54
Grant Bowker Grant Bowker is offline
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Join Date: Jul 2006
Location: Ottawa, Canada
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I think having 1 side of the blades more dirty makes sense. The side pushing the air would also strike any suspended oils, filth or cigarette smoke and the particles stick to the blades. And then the already stuck on particles would collect other, dry particles. I would expect the same on the motor and screens - upstream side dirty, downstream side cleaner.
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