Co2 question

Hello, just joined the boards this is my first post, I'm interested in starting a closet grow and I have a question, I understand the fact that co2 is very important for a plant to glow, and I was basically wondering if need to worry about there being enough in a rather small closet with the door usually closed, there's about a 1" gap on the bottom that would allow air to go in or out. I also have fans inside to cool of the plants and circulate the air. My guess is that it won't be a big deal if there's only 1 or 2 plants in there. I don't really want these girls getting to massive anyways, I was just hoping to here any input. Thanks for any help!

good question, and Welcome.

I will guess that the 1" gap will let enough air exchange to keep the plants in fresh CO².

I would not think a 1" gap will supply enough CO2 all the time. You could replace the solid door with a louvered door or cut out a 18" square hole and put an A/C louvered grill over it to make sure there is enough fresh air getting into the closet. It's not hard to make sure they get enough air even in a closed closet. Not enough fresh air and you will know very quickly. A grill might cost you $15 or 20 bucks and it's cheap for a grow of any size. Make sure, don't guess! Oh, and welcome to the forums and Good Luck!