GreenBuilder G2 Series 80 CFM Wall or Ceiling Bathroom Exhaust Fan with Adjustable Humidity Sensor, ENERGY STARImprove air quality and save energy with the Delta Breez GreenBuilder G2 Series Exhaust Fan. Energy Star rated, this fan features an adjustable humidity sensor and can be installed on either the wall or ceiling. With 80 CFM of power, it effectively removes excess moisture and reduces the risk of mold and mildew growth. Dimensions Housing Length (in.) 8. 25 Housing Width (in.) 8 Product Height (in.) 5. 75 Product Length (in.) 10. 75 Product Width (in.)