Optimal Fan position

You typically pull air out of a tent by installing the inline fan and carbon filter inside the tent and push air out. This created a vacuum. 👍 Inside of the tent: 1. Carbon filter 2. Inline fan pushing air out 3. Ducting to outside Some folks ALSO use an inline fan to also pull clean air in, so the opposite for the second (usually smaller) fan on the outside Use second fan to push fresh air in from outside tent: 1. Carbon filter 2. Inline fan pushing air in 3. Ducting to inside In this array, your pull air out is stronger then your push air in order to create a vacuum. Best of luck on your grow.