Nicely stated Speedslug! I'm no expert but you summed up nicely what has been said in so many vent/fan threads. I've been reading those recently as I am setting up a new studio. I sure appreciate you and those others that are knowledgeable on the subject, sharing what you know! I am planning for a funnel, with a slight slant up to the window, where it will vent. The span from funnel to fan is only a couple of feet. And you validated my fan cfm size I had waffled about. Thank you! Karen
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