Grow Tent Fan 8 Inch Inline Fan Industrial Grade Duct Exhaust Fan Combinable with Filter & Carbon Filter Powerful Booster Fanwith Speed Controller

4 : Air flow: 188 ; speed: 2500 ; wattage: 70W; voltage:110V. Optimizing ventilation by targeting airflow to your plants; 6 : Air flow: 410 ; speed: 2500 ; wattage: 135W; voltage:110V. Optimizing ventilation by targeting airflow to your plants; 8 : Air flow: 677 ; speed: 2450 ; wattage: 205W; voltage:110V. Optimizing ventilation by targeting airflow to your plants.  : This powerful fan generates a low noise output of 50 dB; Whether it’s indoors or outdoors, this quiet fan runs smoothly and won’t disturb you with a consistently loud whirring noise. : The external speed controller allows you to control the speed of the fan freely and meet your different needs. : With the protection grade, this duct fan can effectively prevent splashing liquid and solid particles with a diameter greater than 1mm from entering the machine. So you can use it with peace of mind. : After plugging in the power and turning on the switch, the inline duct fan will start working. So you can use it easily without a complicated operation process. And it comes with a mounting bracket that you can attach with a cord for easy installation.