Keeping CO2 contained in room

Ok here is my problem. My small veg room is sealed off except for one vent. and i have an exhaust fan in the top of the room. that pumps the hot air out. How can i add CO2 to the room without pumping it all out thru the exhaust fan. Thanks in advance

I dont want to waste my time tryin out somethin new ya know. So tell me what setup w/co2 works best and i will try it out. I have another 5x5 veg spot thats empty

You have to hook up the exhaust fan to a timer so that it turns off while you inject Co2 into the room. I inject my Co2 for 15 min, and then leave the fan off for 45 min. to let the plants soak, then turn my fan on for 15 min. to suck out all the heat, then repeat for the entire lights on cycle. There is a website where you can determine your flow rate (how much co2 is released during the 15 min on cycle) based on room size. There is a link to it somewhere on this site or a google search could probably find it.

Thanks man. Im going to try it

my exhuast is high in my room, it needs to be on all the time keep the heat down so i just double co2 the dosage and let it flow with the air.

What about the wine makers kits. What kind of co2 levels do they produce? And if i run a setup like that, can i just have my fan on every other hour?

The room i will try this in is a 5x5.

Hey I have brilliantly come up with a plan on this Co2 deal. I have my veg closet ducted into my flower room. When the veg plants (clones) go night night for their 6 hrs of sleep the air is still being ducted into the bloom room and a person has to know them veggin in the dark is outputting copious amounts of Co2 to those in flower on the 12-12 cycle. I am so smart I scare myself sometimes.

Very interesting, would be even better if i was setup like that.

big wheel: have you ever metered what this "copious" amt. levels are? How many plants does it take to reach 1300 ppm?

Im doubting that it's even close to whats needed... *(unless you're only supplying to a small tent)

i agree with BL, im pretty sure you have got your calculations wrong here