Yescom 4" Inline Duct Booster Fan Aluminum Blade Hydroponics Grow Tent Cooling Ventilation Exhaust Air Blower Upgraded Heavy-duty Motor: UL listed for safe use and More powerful and efficient High-quality Aluminum Fan Blade: More durable and powerful than plastic fan blades Thicker Galvanized Steel Sheet Housing to avoid deformation in transit Come with 5-1/2 feet Grounded Power Cord with US standard plug Dimension: 7-1/2" L x 4" W