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A 48-inch exhaust fan can move impressive free-air CFM on a catalog page and still underperform badly once it is connected to louvers, ductwork, dirty filters, sound attenuators, or a high-resistance wall hood. That gap between rated airflow and delivered airflow is why industrial fan technology trends matter to facility managers, engineers, contractors, and operations teams. The best advances are not just about larger motors or higher advertised CFM. They are improving controllability, part-loa …