90 cfm recommendable for bathroom, utility room, and others. Noise level - only .7 sone. Power consumption - only 21W. Designed for continuous operation. 4 inch round duct. UL listed for tub/shower enclosure when used with GFCI branch. Meets Washington State Ventilation and Indoor Air Quality Code. Manufactured in certified ISO 9001 facilities. Download PDF Spec. sheet for the FV-08VQL3.