For smaller attics, garages, or greenhouses that still need strong airflow, this 16-inch shutter exhaust fan delivers up to 2438 CFM using a 77-watt AC motor spinning at 1500 r/min, moving air at roughly 7.3 meters per second. The automatic louvers open when the fan powers on to vent heat, dust, and odors, then close on their own when it shuts off, helping keep rain and debris out between uses. A steel housing with a rust-resistant coating holds up to damp conditions better than plastic alternatives and resists warping under repeated use. Setup is simplified with a prewired power cord, so there's no wiring needed before mounting; note that the speed controller and power plug are sold separately. Measuring 18.9 x 18.9 x 8.11 inches and weighing 11.82 pounds, it's sized for sheds and workshops that need dependable, weather-resistant ventilation.