Professional Grade Products 9800394 Shutter Exhaust Fan for Garage Shed Pole Barn Hydroponic Ventilation, 265 CFM, 6" 6" Fan Blade that Produces 265 CFM at only 25 Watts Made with Moisture Resistant Plastic and Painted Shutter Easily to Install with Power Cord Included Great for Ventilation of Small Rooms and Buildings Shipped Fully Assembled