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Negative building pressure usually shows up before anyone checks a spec sheet. Dock doors get harder to open, exhaust hoods stop capturing heat and fumes, dust starts moving in the wrong direction, and combustion equipment may backdraft. A proper make up air fan guide starts there - with the operating problems that tell you the building is exhausting more air than it is replacing. Make-up air is not just replacement airflow. It is controlled replacement airflow that has to match the building, th …