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A 20,000 CFM exhaust system cannot perform as designed if the building only has 8,000 CFM of usable replacement air. The result is negative building pressure, hard-to-open doors, reduced exhaust capture, cold drafts, equipment backdrafting, and higher energy use. Knowing how to choose make up air means looking beyond fan CFM and designing the air path, heating method, filtration, controls, and pressure relationship as one system. For warehouses, manufacturing plants, commercial kitchen …