Going to turn this closet into a clone room, suggestions and advice needed

So the temperatures outside have been in the 40s and 50s, my grow tent is outside but because I have a heater in it it stays in mid 70s. But my clones are expose to this cold weather, and while its not killing them I know its slowing their growth.

So I have a closet in my bedroom I have never used, cleared it out, drilled a hole to run the power cable for the t5 ballast im going to use for clones until they are ready to move into the tent. But my main issue is fresh co2 air, I am going to put a fan in there with the light, but I forsee fresh air becoming an issue. But here is what I am working with, its not against an outside wall. Advice on how to turn this into a successful cloning room is appreciated


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Happy Growing RIU,
Roflicer

Is it possible for you to cut a hole in the roof? and run a fan with ducting to get rid of old stale air.. the negative pressure would suck enough air thru the cracks in the doors for the clones?

The hole would be leading to an attic, and Idno i have to go into the attic and check out whats above, but thats probably thats my best bet

Clones don't use much air. So as long as you open the door twice a day your good. No need to make holes. I've cloned many in my closet. Just open door leave open 5 min. Or if you can't open and close it about 10 times and leave shut.

Fantastic, I can def do that, wake up, open door while get rdy for work, open it when i get home

That's what I do.

There have been many studies done on stomata production and early plant growth in co2 deprived environments. I purposely restrict air exchange when my plant are in clone and veg stage in order to increase stomata production, thus increasing the ability for the plant to uptake the natural environmental co2 when the plant is in flower.

Kind of radical but you could drill a 4" hole in the wall and run an intake fan.

I flower in my closet and use a 600w with cool hood, I knocked a hole in closet wall to run exhaust to the closet on oposit side.have a gap under the closet door so i did not have to drill intake hole, the exhaust is going into the closet of another room i just closed the hot air vent for that room and let my exhaust heat it.

Im just not going to worry about it, I sleep in the same room so running an intake fan is kind of ridiculous and wont be able to sleep, for clones it should be enough