intake fan

My grow room needs a better supply of new oxygen getting to it and was wondering the best way to go about it. I was thinking an inline fan with multiple ducts going to different parts of the room. Any suggestions?

CO2 tank or burner

Suck don't blow. Suck air into the room through passive intakes and blow the waste air to a place as far away and isolated from your intake vents as possible.

Normal outside air is 300 ppm c02 and for optimal growth of cannnabis you want around 1500 ppm and you will never achieve that with just a intake fan sucking outside air in..