What makes the Earth Worth 6" Inline Fans and Charcoal filters so special? Quality and dependability. Earth Worth engineers have selected only finest quality components to make this the best inline fan and filter combo on the market.Inline Fans, in conjunction with our Carbon filters help purify the air in your growing environment and prevent build-up of moisture and odors.You can also use your fan connected to the lights to help cool the lights as well.Fan Features:400 CFM115v/60HZ, 77dB(A)Sturdy Aluminum with protective cover to reduce vibration and noiseCentrifugal fan, inlineBuilt-in stand/mount - Easy to install!Quiet operationTop quality motor resists moisture, UL ApprovedCarbon filters, in conjunction with our inline fans help purify the air in your growing environment and prevent build-up of moisture and odors. For most purposes your carbon filter should be hung horizontally at the top of your growing tent or room and be connected to your fan ducting the air to the outside. Since warm air containing particles will rise, drawing it into the filter at the top of your indoor garden and then venting it outside will be most efficient.You can also use your filter with a fan connected to the lights which will help cool the lights as well.Additional Features:Charcoal Carbon Filter scrubs odor particles and purifies airHigh quality white cotton filter padCarbon filters should be replaced approximately every 6 months depending on use.