Cli-Mate’s Speed Controller (SPC series) is a manual fan-speed dimmer for ventilation equipment. It regulates airflow by setting a fixed speed via a single rotary knob and supports loads up to 4 A. The unit operates on single-phase 220/230 V, 50 Hz power, carries IP20 protection, and has a compact body measuring 55 × 40 × 135 mm. Designed for straightforward plug-in use with AC inline fans or extractors, it has no sensors or automation; set the speed you want and it stays there until adjusted. Typical use cases include trimming noise, dialing in negative pressure, or matching airflow to filter resistance in small tents. Available in a 4 A version.