WhisperComfort™ Energy Recovery Ventilator (ERV) is a stand alone system that provides balanced ventilation. Ideal for single family homes and multi-family units, it is affordable, easy to install and energy efficient. WhisperComfort™ ERV is UL listed for ceiling or wall mount applications. Can be used to comply with the latest codes and standards. Panasonic WhisperComfort™ Energy Recovery Ventilator, Low Cost, 120 VAC, 60 Hz, 40/20 cfm or 20/10 cfm, AC Motor, 1095 rpm Motor, 22-1/8 in Housing Length, 13-1/2 to 16 in Housing Width, 7-7/8 in Housing Height, Galvanized Steel Housing, Ceiling Mount