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If you look closer at the first post, I wasn't talking about Co2. But I'm at the moment in the process of comparing both approaches - ventilation vs Co2 enrichment. I'm trying to understand which would suit me better in my conditions.

Isn't 85F slightly too much when using ventilation? However, yes to your answer - I'm sure I will be able to add enough extra heat besides lamps and still be able to ventilate adequately. I'm more concerned about the night time when lights are off, but there are many different solutions in...

Let's forget Co2 enrichment for a second. 1) What if I set the speed of extractor fan at what is required for maximum growth.. 2).. and then set the heating device to maintain a required temperature? If it's freezing outside of the grow room, how else would you control temperature? Can I be...

Thank you.

Many of us would agree that a grow room should be ventilated at the rate of 0.2 air exhausts per 1 minute at minimum and 3 air exhausts per 1 minute at maximum, so 0.2 - 3 air exhausts per 1 minute. Example: Room size is 100 square meters x 2.5 meters of height = 250 cubic meters. Question...

Thank you for the information. I have been recommended to choose a dehumidifier by the capacity of 4-5 gallons per 1000W of light, when using co2 in a sealed room.

I like to grow with 1000W HPS lamps.

Very interesting post. Thank you for the information. I will certainly do more research about this matter.

According to my calculations I'm looking at the investment of 300-600€ per 84-day cycle (from late veg until harvest) with my gas price being 0.69€ per liter. It seems that I couldn't have gone very much wrong with my calculations. Now I know that I'm rather looking at 500€ for the gas instead...

Well, plants consume Co2, but I don't know at which rate. I only know that I need to keep PPM at 1500.

The main reason why I'm considering going this route is because I have a hard time controlling my LOW temps due to cold weather and big grow room.

https://www.rollitup.org/t/how-often-to-generate-new-co2.427285/ According to this thread, I've found people suggesting different things - different opinions about how often to generate new co2. Opinions varied from every 20 minutes to every 66 minutes (off time). This calculator does not...

When flow meter is set at 20 cubic feet per hour, it will take 30 minutes to fill the room to 1500ppm with co2 using propane (co2 burner/generator). This is what I know now, but one thing that I don't know is that how often do I need to refill the room with co2. In other words - how many times...

What the fuck? Air exchange rate? Why are you talking about ventilation? I'm talking about Co2 enrichment. Obviously it's going to happen in a sealed grow room. You don't need to know the size of my room in order to be helpful in this matter.

I mean really.. I'm not going to be keeping PPM at 1500 by breathing. I'm trying to get an idea of the fuel consumption when going for the Co2 generator route.

You didn't say a word about the size of your tank.

Big question: Does 15-20% larger = 15-20% faster? In theory, when I want same sized plants it would take them 15-20% less time to get there, right? - instead of 10 weeks it would take 8 to 8,5 weeks and I would win 1,5 - 2 weeks of time?

Theoretically, if you vegged plants for 10 weeks using ventilation, then for how long would you need to veg the plants when using Co2 if you want them to grow to be as big as before - same in size? In other words, how much time is it possible to "win" using Co2 in a sealed room compared to...

Okay, I entered 24 cubic feet per hour for an example: -------------------------------------------------- Result Grow room area: X cubic feet Amount of CO2 required: 9.9 cubic feet On time: 24.9 minutes At this flow rate: If you are using a 20 pound CO2 bottle with a regulator, it will last...

I found this calculator: http://www.hydroponics.net/learn/co2_calculator.asp It asks for 3 things: 1) room size 2) amount of Co2 to add in PPM 3) flow meter setting or generator size in CFH (Cubic Feet per Hour) What the hell is the third one and how do I get to know the answer for this? I'm...