The LB Fans 7.5 Amp Single Phase 5 Step Auto Transformer (model SPM5075) is a robust and efficient speed controller designed for commercial ventilation systems. With five selectable speed settings, it enables accurate regulation of fan performance while keeping motor noise to a minimum and preventing magnetic hum. The controller features an integrated ON/OFF switch for simple operation. Part of the LB Fans Controllers & Sensors range, this unit combines durability with ease of use, making it well-suited for a wide range of ventilation control applications.