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A warehouse exhaust fan running at 100% speed during a cool morning may be moving far more air than the building needs. The same problem appears in manufacturing plants, grow rooms, livestock barns, data centers, and high-heat equipment spaces: fixed-speed fans continue consuming full power even when heat load, occupancy, process demand, or outdoor conditions change. VFD fan speed control benefits facility operators by matching airflow to the actual condition instead of operating every fan at ma …