20 inch Shutter Exhaust Fan, Wall Mounted Attic Vent Fan with Smart Programming Variable Speed Temperature Control, 2900 CFM,EC Motor,Timer, for Shed,Garage,Greenhouse Ventilation Cooling,Black

Rapid Venting: This shutter exhaust fan delivers 1500 CFM to quickly expel stale air, floating dirt, heat, and smells, keeping indoor air fresh. Also works as a high-airflow exhaust fan for sheds and workshops
Smart Programming: This fan features an intelligent controller with temperature and humidity triggers, offering up to 10 speed settings that automatically adjust to changing conditions. Multiple modes, timer and alarm, full control for any situation
Premium EC Motor: 1500 RPM and 50W provide up to 8.8 m/s airflow while running smoothly with low noise, efficient and stable for a quiet, comfortable experience. Ideal as an attic fan for year-round ventilation
Tough Build: All-metal steel construction offers high rigidity, deformation-resistant, and handles damp and rain, more sturdy than plastic and ready for harsh weather
Rain Guard: Shutters open when powered for ventilation and deodorizing, then close when off to block rain and small things, reliable protection for an attic exhaust fan setup