The Aero Pure Extractor Fan with Cyclonic Technology is an energy efficient alternative to traditional ventilation and is designed to reduce humidity and moisture, remove obnoxious odors and gases, allergens, and dust particles. Quick and easy to install whether you are remodeling or starting a new construction project. Cyclonic Technology improves Indoor Air Quality by forcing air out the sides of the fan and down along the wall of the room capturing 10X more contaminated air than traditional exhaust fans. The contaminated air is then pulled up into a tight vortex in the center of the fan and quickly removed via duct-work to the outside. No Need to climb into the attic with this lite-weight fan- just 5 lbs- that install from below securing to the ceiling with four dry wall anchors Designed and approved for recessed installation in insulated ceiling In new construction, install from below the ceiling after the sheet rockers and painters have finished; no can or trim needed, and