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  1. wegmeister

    Positive Pressurization Required

    to maintain a given positive pressure door(s) closed proceed as follows : calculate total squarefeet of crack ,figure out how much air you have to force across the crack to create a pressure drop of say 0.2" W.G. Normally,300 cfm will be plenty for 1 door.Use a centrifugal fan and HEPA...

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