Ventilation for small 2x2

My main grow is a 5x5 with intake and exhaust ducted to outside. Im setting up a separate 2x2 tent with 100watt mars led to play around with a couple autos and maybe later on as a mother/clone setup. Trying to decide where i want this tent amd that depends on ventilation. For something this small, one or 2 little plants, do i need to pull air from outdoors to get the best results? The closet in our bedroom has the perfect little nook to throw this tent in. I could vent it into the bedroom. Im wondering if this could potentially be even better than outdoor air. My wife and i sleep with door closed, no open windows, no hvac. Im sure its not great for us, but according to a couple air quality studies i looked at, our bedroom is most lilely sitting somewhere between 1000 to 1500ppm of co2 at night while we are sleeping. I can center the lights on cycle around that time, dark cycle during day when co2 is less concentrated. Question is, how much co2 will one or 2 small plants consume vs what my wife and i can produce? I will probably need to just get a co2 meter and test this for myself, but im curious if any of you guys have tried a small setup like this with and without air from outside and noticed a significant difference. Often heat and humidity are deciding factors when needing to exhaust but i dont think that will be a concern in this case. 100watt led doesn't make much heat and the amount of humidity transpired from the plants will be managed by my air conditioner in our bedroom which will be running by the time the plants are big enough to transpire a significant amount. Is there anything else i should be considering other than temp, co2, and humidity?

ok we are getting into advanced calculus with shift changes and charts. it's just too much for me

Be sure you still have plenty of air circulation around the plants. That is key to keeping them healthy and fungus free. I have a 2x2 with a 100 watt led and it's surprising how hot it gets-just keep an eye on the temps throughout the day and see if it ever goes in the danger zone. For ventilation, I just have the $22(ish) AC Infinity 4" duct booster fan-it doesn't move much air even at max but it's enough. As far as co2, you are fine. My plants mostly just get what my dog and I produce during the winter, though I do try to get some fresh air in a few times each day even in super cold weather.

Rurumo said:

Be sure you still have plenty of air circulation around the plants. That is key to keeping them healthy and fungus free. I have a 2x2 with a 100 watt led and it's surprising how hot it gets-just keep an eye on the temps throughout the day and see if it ever goes in the danger zone. For ventilation, I just have the $22(ish) AC Infinity 4" duct booster fan-it doesn't move much air even at max but it's enough. As far as co2, you are fine. My plants mostly just get what my dog and I produce during the winter, though I do try to get some fresh air in a few times each day even in super cold weather.

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Ah yes, fungus and mold. I will for sure give good circulation within the tent and a 4inch exhaust fan at the top of tent as well as duct in air from the bedroom so its not just reusing air from the closet. Mold is definitely something for me to consider. This winter i noticed it didnt take long for condensation on the windows to start a bit of mold down in the window tracks. Kind of an older house so maybe more than average mold spores floating around. My main grow in basement has forced air (positive pressure) intake from outside that passes through a merv 13 filter. Exhaust is pushed out by positive pressure from intake. Not as good as negative pressure for smell control, but it allows me to 100% control what comes into the grow. With negative pressure, small amounts of air get pulled in through various small spaces at bottoms of walls, right where spores would be hanging out. Maybe ill use a filter on the 2x2 intake as well