Question

I just set up my Gorilla Grow Tent with the carbon filter and exhaust fan. there are extra holes in my Gorilla Grow Tent that I'm not using should I close them or leave them open for ventilation?

I have Jardins so not familiar with gorillas but If you mount filter on ceiling like I do then I'd close the top holes if you have them and just keep bottom vents open as to direct air flow up from the ground. I had all my uppers open last run and ended up with a lil mold because filter was sucking air straight from the hole next to it...no good lol

I think Trich is giving you good advice. I like to keep the vents that are built in for ventilation open because they have filters built in and the other holes that are not in use blocked off. When you are in your 12/12 cycle you will not want all those light leaks, and you might as well get the ventilation dialed in before it's critical. Later on if you are having trouble with too little ventilation you could always buy a photo booth light trap to allow more light in one of those larger holes.

Close them, you want to open only the vents with the mesh on the bottom (if you have them). Filtering your input air is very helpful for pest prevention.

I have a 5x5 gorilla.

I exhaust out the top. close all other vents, except one on the bottom with the mesh screen. I keep that one open to create a passive intake.