16 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 simple The product formula is free

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16 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 simple The product formula is freeSpecifications Place of Origin China Main Color Black Main Material Metal Dangerous Goods #dangerFlag# Dimensions & Weights Assembled Length (in.) 20. 47 Assembled Width (in.) 10. 24 Assembled Height (in.) 20. 87 Weight (lbs) 17. 58 Product Features Rapid Venting: This shutter exhaust fan delivers 2900 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