Ventilation help

Running into odor control problems, inside the house. I can directly vent to the outside. So I'm running 20 feet of 6 inch ducting. I have 2 300 CFM fans. Would there be an advantage to running 1 to push at the beginning of the duct. And one at the end pull it outside? No carbon filter is needed as it is legal to grow here. Grow area is 3 x 6 x 9 tall. Is that enough CFM?

Since I did not get a reply I tried with one fan pushing. Then I added the one pulling much much much better result

I do that too. I have a 6" fan pulling from my carbon filter and into an air cooled sealed hood. Then the second 6" fan pulls from the second hood and pushes the exhaust out about the same amount of duct.

Out the chimney in summer. Under the living room in winter for supplemental heat.

An intake fan to the room can also help the exhaust fan work better but it is important to maintain negative pressure or the smell will push out of the room.