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  1. Boxxed

    Bathroom exhaust fan

    Thank you.. I think this is what I have going on "Remember that increasing the fan capacity is not necessarily going to allow you to run a longer duct system unless you increase the duct diameter as well. This is because a more powerful fan without a larger duct will result in more friction and...
  2. Boxxed

    Bathroom exhaust fan

    My bathroom is about 50sq ft. with 4" rigid running horizontal about 25' with a 120CFM exhaust installed. It did not seem to clear the room that great. So, I put in a 300CFM fan thinking it would be better but notice I am getting blow back from that and it seems like it made it worse. (I was...
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