MaterialFabricated out of premium iron and construction strengthened by screws ensure its working longevity. FeatureThis inline duct fan is engineered to boost air in forced air heating and cooling systems without upsetting the balance in the closed loop system. Minimize NoiseThe balanced blades design for minimize noise and vibration. the Motor with permanently lubricated bearing operates quietly. Easy to installFluted on both ends to receive ducting. portable and lightweight and can be installed anywhere. CompatibilityThis fan suit for various environment such as work shops, indoor growing rooms, warehouses and so on. it is ideal for boosting supply air, return air and venting. Color: Silver Material: Casing is made of galvanized steel Diameter: 4 inch: 100mm Input power: 4 inch: 25W Rated voltage: 220V Air suction volume: 4 inch: 140m/h Rated frequency: 50HZ Operating noise: 30-34db Rated speed: 2800r/m Package Includes:1 piece blower