18 in Shutter Exhaust Fan Wall-Mount Automatic Louvers Variable Speed, Sturdy Steel Housing, Low Noise, AC Motor, 3051 CFM Ventilation and Cooling for Attic, Garage, Barn, Greenhouse, Workshop

Rapid Venting: This shutter exhaust fan delivers 3051 CFM to quickly expel stale air, floating dirt, heat, and bad smells, keeping indoor air fresh. Also functions as a high-airflow exhaust fan for sheds and workshops.
Smooth Variable Speed: Stepless variable-speed control puts airflow at your fingertips. The included controller lets you adjust the exhaust fan from a gentle breeze to a powerful blast to suit different ventilation needs.
Premium AC Motor: With 1400 r/min and 79W power, this attic fan delivers up to 7.7 m/s airflow while operating smoothly with low noise, offering efficient and stable ventilation for a quiet, comfortable space.
Tough Build: Steel housing provides high rigidity and resistance to deformation, handling damp conditions and rain better than plastic. Built sturdy for demanding attic exhaust fan and ventilation setups.
Rain Guard: Shutters open when powered for ventilation and deodorizing, then close when off to help block rain and small debris, making it a reliable choice among exhaust fans for protected airflow