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A fan that pulls 20,000 CFM out of a building sounds productive right up until the doors get hard to open, the heaters backdraft, and the airflow at the process line drops below spec. That is where exhaust ventilation vs make up air stops being a product question and becomes a system design question. Too many ventilation problems start with a fan selection made in isolation. Exhaust gets the attention because it is visible - smoke leaves, heat leaves, odors leave. But every cubic foot of air exh …