How often Co2 exhaust are required during dark time

Indoor Growing
1

Hey guys,
How often and how many minutes we should turn on exhaust fan and bring fresh air? Thanks

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2

Are you using co2 bottles? If your running extra co2 I’m pretty sure you should have a sealed room. If your not running co2 and just talking about fresh air in a vented room you should have a constant exchange of air. Day and night

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Welcome man, I’m learning too… From a searched out there, or soon a more experienced person appears to help… You will like being here…

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4

It is sealed room, no duct , just split air conditioning.
Now I have container and it have natural gas co2 running at 1200 ppm in day, night cycle , how much co2 should be. Wondering how frequent, we should bring fresh air in sealed room environment

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That I’m not 100% sure on that. I was always under the assumption that the added co2 in a sealed room eliminated the need for that. But I really don’t know, I never ran a sealed room. I thought you were using a vented room

6

CO2 at night should be off. The plants only utilize CO2 for photosynthesis. My controller only turns on when the lights are on.

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My co2 is off as well. My question is how much fresh air is required in night time? How often we should turn on exhaust fan and bring fresh air in?

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8

I never bring in fresh air unless I enter the room.

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I agree I also never bring in fresh air to my c02 room . In 12 hrs dark it might drop to 700 ppm once the lights kick in its back to 1000/1200

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10

Exactly, maybe if the room was hermetically sealed we would need to bring in fresh air.

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11

Hey @ReikoX. Have you seen these co2 burners they have nowadays? If so what’s your take on them? Thanks

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12

I’m sure a NG burner would be a lot cheaper to run, but could cost a bit upfront to get the plumbing ran. LP burners also exist too, and tanks can be filled/exchanged everywhere.

Burners generate heat where my cylinder doesn’t and my cylinder will never create a fire if it malfunctions. In the end that is why I went with the cylinder and solenoid.

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13

My burner is 4 years old so far no issues . There is the risk of fire and the heat it generates but bottles were too much confusion to get filled .

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14

I have a bottle exchange right by my work. If I had to drive across town, maybe it would sway me towards a burner.

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This is my first run with CO2 and it is costing me about $2/day to run.

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My favorite Co2 techno write-up.

https://manicbotanix.com/co2-enriched-hydroponic-growing/

Burners seem to $hine for larger grows. (Like @ShiskaberrySavior )

While bottles are good for smaller grows.

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17

On this forum, no one understand the question that I asked and they start talking about something else?

How many minutes or how much fresh air with cfm/hour is required during dark cycle of sealed grow rooms?

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18

If no one knows then don’t through the BS on this forum. Thanks guys

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19

We are trying to help.

Several growers answered.

No venting is required during the dark cycle, for a sealed grow.

Zero minutes. Zero cfm/hour.

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20

I read on another forum from a “consultant” who said that when they build sealed rooms for clients they do build in exhaust systems to bring fresh air in to do an air exchange a couple of times a day. I can’t remember the exact details why but it had something to do with the plants off gassing some compounds that if it gets built up enough over time without doing an air exchange it can be harmful to the plants. I had always heard that no air exchanges were needed in a sealed room but I have never run a setup like that myself so I cannot say for sure. It sounds like a few folks here that do run sealed rooms don’t do air exchanges at all.

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