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I sealed my attic door and a set of 3 old windows downstairs with plastic. When everything else is closed up the two sets of plastic become extremely tight and you can see/feel the pressure pushing the plastic into the house. Almost to the point of ripping the tape off holding the plastic. Today was a nice day so I opened a downstairs door and as expected the pressure on the plastic was just about gone. So the question is how do I shore up these two massive air exchange areas but not create a negative pressure issue, which I assume is causing issues elsewhere.