Fans, when to run them, at what temp/humidity, etc??

Alright, So i got a few questions about fans.

In a room that uses co2, so it is pretty much completely sealed
Would i be able to use a carbonfilter with a fan attached to it and just circulate the air in the room, would the filter work like this? or does it need the air need to be ran through the filter and purged/dumped outside of the room?

Also, if i can just circulate the ambient air in the room through the carbon filter, there will also be a intake anf an exhaust fan.

Will intake fan work well if it is pulling air from another room that isn't used for growing? And when should it go on? at what temp/what humidity?

Also, the exhaust fan will be dumping out air of the grow room under the house or into the ceiling, when should it come on? at what temp and humidity?

Should exhaust/intake/carbonfilter fan's be on at the same time? or should they run seperately? I am a bit confused about this. Can someone help me out??

Thanks for everything guys you've been more than helpful!!

Heres a random picture i found for your viewing pleaseure

i run my fans 24/7 through the whole grow...and you should be able to run your exhaust with carbon filter no problem if your fan isnt a weak lil one

I understand you can run your exhaust thru your filter but do you have to? If you're using compressed co2 it would become expensive dumping your co2 that often. I'm wondering if you can circulate your air through your filter and have a seperate fan for exhaust and seperate fan for intake, and if so when do you run them? Also there will be a oscilating fan In the room to blow the plants around to stiffen/thicken up their stems

Bumptiy bump, so is it possible to run a fan/carbon filter that just recirculates the air in the room? What do you guys that run co2 bottles do with your intake and exhaust fans and your air filtration systems? Given the heat from the lights is not an issue.

toooo the top, can anyone answer this?