fresh air in from outside...nasty air inside pushed outside and scrubbed with filter....you will be pleasantly surprised with that result...had to modify my rooms last night in such a manner and the difference is crazy!!! I'm running 3 rooms with 5000k watts of light in each room so it gets hot pretty fast. Last night my temps never rose above 73 and 35% humidity after this modification
Jord0713 Reviewed by Jord0713 on . odor control Here is my set up: 5'W 3'L 8'H grow tent. 165 cfm 4" Hydrofarm inline fan and a 4" carbon filter. I have the inline fan sitting on top of the top vent whole on the outside of the tent. I used some dryer vent tube to run down into the tent to the carbon filter which i have hanging on its side at the top back of the tent. ( are the filters supposed to be vertical or horizontal ) mine is horizontal right now. for the intake vent i use one of the velcro flaps at the bottm side of the tent which Rating: 5