Aero Pure AP 90H-S G6 W Slim Fit Bathroom Fan with Integrated Humidity Sensor, TrueWhite Finish Slim fit housing fits 2 x 6" or greater construction; designed and approved for recessed installation in insulated ceiling or wall, AP90-S this is the base model number that we use to create the AP90H-S Integrated user-adjustable humidity sensor responds to change in humidity above adjustable set point (50-100% relative humidity) Energy star qualified; etl/cetl listed for use in tub/shower enclosure when used with a gfci branch circuit wiring to remove moisture at the source Air volume: 90 cfm; noise level: 0.3 sones. Exceeds minimum standards for continuous run Full six (6) year warranty. Must be installed by a licensed professional