The Vevor 14" shutter exhaust fan is designed to deliver strong 1400 CFM ventilation for sheds, garages, greenhouses, attics, and workshops. Its variable speed controller allows smooth airflow adjustment to match different ventilation needs. The AC motor runs at 1520 RPM for efficient performance with low noise. Built with heavy-duty steel construction and automatic shutters, it helps protect against rain and debris when not in use. This wall-mount fan is a durable solution for improving airflow and removing heat, dust, and odors.