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A warehouse bay that pulls outside dust through every door crack, a grow room that will not hold temperature, or a paint area with doors that feel unusually hard to open all point to the same engineering question: is negative air pressure being controlled, or merely tolerated? Negative air pressure is often necessary for contaminant containment and odor management. It becomes a problem when exhaust volume exceeds available replacement air by more than the building envelope, make-up air equipment …