Model SP-AP features a virtually silent electronically commutated (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 comply with ASHRAE 62.2, WSEC, and CAL Title 24 requirements. Fan features allow for improved performance in a variety of installations, improved indoor air quality and the elimination of issues during test and balance. Units come in lighted and no light configurations with plug and play sensors (humidity, motion, nightlight and CO2) available. Up to .5 in. wg.