Flowering Stage Ventilation Tips?

[Greenlivin]

Alright all you veteran growers. I’ve got a tough one for you.

I am into week 2 of 12/12 and understand these girls need plenty of CO2. I have a grow tent with three rectangular shaped vents on the bottom, and have kept all but one closed so far (where my intake fan blows in). My question is this- should I open up the opposing vent to help bring more CO2 into the tent? Should I open all 3? Thanks!

[Toker1]

I leave all 3 of mine open. I have passive intake.
The more air you can pull through, the better.

[Bengfan]

As long as no light leaks in. Also, consider the cfm of your extraction fan. For me, to make it simple I just try to triple the intake (when passive) of the fan. Example, 6" extraction fan = 3 6" holes for intake. Good luck!

[Toker1]

I have had lots of light leaking in from the vents with no ill effects. Just a note, my plants were always taller than the vents themselves.

[Tersky]

Doesnt matter. I open vents during day to help with heat and close at night except back vent which i cover with cardboard at an angle to block light. I dont add any supplemental co2 and i dont use an intake fan. No need for it if you have an exhaust fan.

[kingfish]

The only time I use my exhaust fan is after I watered my plants and put them up for the night to keep the RH down. As for co2, I have never used it. My grow does not need it. Besides, most people that do use it, use it incorrectly anyway.