CO2 question

I have a question concerning CO2. If one had a sealed room that was about 158 cubic feet, how much CO2 would one have to use to keep the gas at 1500ppm? I used the calculator-link on the sticky in one of the other forums, and according to that a 20# bottle would last about 7.24 days in a 158 cubic foot space. Somehow this doesn't seem correct. I was wondering what some other folks might think. In this situation, about how long would a 20# bottle last if one were using the "sealed room" approach, as opposed to just using CO2 to "boost" the atmosphere periodically during the light cycle in a non-sealed room? Thanks, in advance, for the input!

It depends in a sealed room with no air exchange a 20# bottle will last a while after the ppm gets up to 1500. The first bottle is always short because it takes so much just to get up that high.

450 ppm during the day and 750 ppm at dusk. I hope this helps you. Good luck

qazwers1 said:

It depends in a sealed room with no air exchange a 20# bottle will last a while after the ppm gets up to 1500. The first bottle is always short because it takes so much just to get up that high.

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Dude what are you talking about? The first bottle?

So I am someone who runs Co2 in a closed tent with sealed cooling system. I have a 20# tank and use a brain to control my Co2 through Fuzzy logic, so it monitors the air constantly and only releases a small amount of gas until the desired ppm is reached. My tank is on it's 3rd week and still reads in the top 80% of level. I only run it for 12 hrs a day and have had a slightly lower ppm level of 1100.

Any question you may have ask away and I can post pics...JR

So you lost interest? just wondering what you thought........JR

i need a fuzzy logic, maybe for fathers day? i've had my eye on this one.

http://www.plantlightinghydroponics.com/hydrogen-senseair®-co2-monitor-p-2793.html

I'm about to write a review on the CAP unit, it is so easy to use, the best 600 bucks I spent in awhile. JR

Thanks for all the replies. I wouldn't be able to get a controller, but would have to figure how long to run the CO2 every hour to keep the PPM up. Thanks again for all the info

go to hydrofarm.com it has a calculator for the co2 and area you are working with

Use the calculator.....fill in the info/ for my room this it what it calculated with the flow meter set at 1 cfm

Grow room area: 768 cubic feet
Amount of CO2 required: 0.9216 cubic feet
On time: 55.296 minutes



read the side note below

"This form will calculate how much CO2 will be needed to fill a grow room to the required level. It will also determine how long it will take to fill at the given rate.
It will not calculate how often you will need to refill the room with CO2. There is no way to calculate how much the plants will use or how much leaks out! Usually you would want to refill just after an exhaust cycle or every 3 hours.
*The air already has about 300 PPM so you only need to add 1200 PPM more to get the optimum level of 1500 PPM."



http://www.hydroponics.net/learn/co2_calculator.asp

Icannabis said:

450 ppm during the day and 750 ppm at dusk. I hope this helps you. Good luck

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can I ask where you came up with these ridiculous figures & why more at dusk when the can't use it at night?