Quick question about my co2 tank

I have a completely sealed 4x4x7 tent that I am injecting with CO2. I have the regulator set to the proper amount and I run it for 7 minutes every 3 hours as instructed to maintain 1500 ppm. My question is, how long do I wait after the CO2 turns off before I turn my intake/exhaust fans back on for the tent?
Thanks everyone who read this.

It has been my experience to bring in your fresh air right before injecting co2. I set my regulator to turn on for 15 mins every 2 hrs. the room is 8x8x10
So basiclly I have an intake fan that comes on 15 mins before the co2 and shuts off a min or two before the co2 comes on. that way I am not loosing any co2 by pushing it out the seams or cracks. this is repeated the entire time the lights are on since the plants dont use co2 when the lights are out. Hope that helps.

so you only turn your intake fan on for the 15 minutes prior to running your co2? The rest of the time you have no intake/exhaust? I'm brand new to co2, but I guess that makes sense to let the plants fully take in the co2 as long as it remains around 1500 ppm. Thanks for the help!

MICANNACARE said:

It has been my experience to bring in your fresh air right before injecting co2. I set my regulator to turn on for 15 mins every 2 hrs. the room is 8x8x10
So basiclly I have an intake fan that comes on 15 mins before the co2 and shuts off a min or two before the co2 comes on. that way I am not loosing any co2 by pushing it out the seams or cracks. this is repeated the entire time the lights are on since the plants dont use co2 when the lights are out. Hope that helps.

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The intake fan seems uneccesary really why not just have passive intake and have your exhaust fan shut off before the Co2 comes on its the same thing.. if your "exhausting" then you have to be "intaking" or you wouldnt have anyting to exhaust lol ...........if you have an exhaust fan at the top and a vent at the bottom then you are bringing in fresh air aslong as the exhaust fan is running... So just keep your fan a the top use passive intake and shut your fan off when the Co2 comes on like you said in the begining..... Now how long to shut fan off for???? well that depends on your room size and fan size and getting a meter to read the ppm in the room is the only real way to ever now exactly how long to leave your fan off if you dont have a co2 meter than it will never be an exact thing.. But im not a Co2 buff so maybe someone else has some better advice on how long to shut your fan off.....Main thing is look at how my cubic feet of air is in your room and then look at what your Fan CFM is rated to see how long it will take to clear a room out of air......if your room is 200 cubic feet and your fan is 200cfm then your fan will exhaust all the air in the room in 1 minutes time....