Aero Pure VSF110DMH-S W Adjustable-Speed DC Motor Bathroom Fan with Integrated Humidity and Motion Sensor, White Choose from 5 different airflow (CFM) settings- 80-90-110-120-140 CFM- with adjustable dip switch Integrated motion and humidity sensor triggers fan to preset speed; adjustable built-in delay timer from 3 to 30 minutes; meets Cal Green requirements Slim Fit housing fits 2 x 6" or 2 x 8" construction Designed and approved for recessed installation in insulated ceiling or wall ENERGY STAR qualified; ETL/Celt listed for use in tub/shower enclosure when used with a GFCI branch circuit wiring to remove moisture at the source