The Vevor 16" shutter exhaust fan is designed for rapid ventilation with 2900 CFM airflow and a smart programming controller for adjustable operation. Its EC motor delivers efficient 1400 RPM performance with low noise for use in sheds, garages, greenhouses, attics, and workshops. The wall-mount design helps save space while improving air circulation and reducing heat, humidity, and odors. An all-metal steel construction adds durability for demanding environments, and the automatic shutters help block rain and debris when the fan is off.