The SP-AP features a virtually silent EC motor with three built-in high speed airflow settings (50, 80 or 110 cfm). Its standard two-speed operation (commonly known as whole house) helps meet ASHRAE 62.2, WSEC, and CAL Title 24 requirements. Fan features improve performance in a variety of installations, improve indoor air quality, and eliminate issues during testing and balancing. Units come in backlit and non-illuminated configurations with plug and play sensors (humidity, motion, night light and CO2).