The Elicent® External Mount Duct Fan provides a simple through-the-wall solution that can be sidewall mounted on the exterior of a building, allowing easy access to the fan. These fans are the perfect solution when space restrictions prevent the use of in-line duct fans. Ventilate tight spaces such as basement kitchens, laundry rooms, crawl spaces, high rise buildings, apartments and more with EXT external mount duct fans. These quiet and energy efficient fans utilize external rotor motors. EXT external mount duct fans are available to fit 4 inch ducts, with airflow capacities to 177 CFM.