First sealed grow room build out. Couple major questions regarding CO2 levels at night and controlling ppm during dark hours.

  • Thread starter Mcmc631
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Mcmc631

Mcmc631

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back ground info:
Room size: 10x20
Location: basement
Grow room: sealed
Medium: hydro
Method: RDWC
Plants: 10
CO2 tank: 20lb running at 1200 ppm flower
CO2 regulator and controller: yes
Lights: (4x) HLG 600RSpec
Air scrubber: yes
8000btu ac unit: yes
Dehumidifier: yes
Oscillating walll mounted fans: 4x yes
Ph controller: yes

Ok so at night I know I don’t have to run CO2 as the plants are naturally producing it during dark hours. I have read that this can cause CO2 levels to spike to 1500 ppm during dark hours. I have also read the only effective way to combat that this is to pump in fresh air at night.

Being that my room is meant to be sealed wouldn’t that defeat the purpose of a “sealed” grow room? Also isn’t that the point of the air scrubber so I don’t have to pump in fresh air? Thanks in advance, will post pictures when it’s all finished currently literally just got got cutting all boards to be be framed prior to insulating and applying vapor boards.to concrete walls
 
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Beowuuulf

Beowuuulf

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What's the problem? The spike to 1500? It will be fine. You can run 2000ppm+ co2. Don't inject co2 at night and don't worry about removing any co2 the plants make at night.
 
1diesel1

1diesel1

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Main purpose to seal a grow room is to control effectively your co2 level without loosing content. You need a titan co2 controller, it controls output with lights on and shuts it off with lights out.
I have used this controller effectively for years.
There is no need for fresh air intake during lights out. I have never had any issues.
Main thing is controlling your temperature when the lights are out and obviously when lights are on.
 
Mcmc631

Mcmc631

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Main purpose to seal a grow room is to control effectively your co2 level without loosing content. You need a titan co2 controller, it controls output with lights on and shuts it off with lights out.
I have used this controller effectively for years.
There is no need for fresh air intake during lights out. I have never had any issues.
Main thing is controlling your temperature when the lights are out and obviously when lights are on.
Sweet I have an autopilot controller that I’ll be using, there’s just so many mixed reviews on venting and not venting the grow rooom after lights out. I heard running a small slight stream of fresh air is also most beneficial.. calling it a hybrid sealed room? Defeats the purpose if you ask me. I just finished with my vapor barrier boards on wall one
 
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Fairytalez

Fairytalez

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Hey bud.. I got a sealed grow I'm almost done building myself. To answer your question.. firstly I would increase the CO2 to 1500. But to fix the spike problem.. all ya gotta do is stop feeding CO2 just 1 hour before lights off, and don't start feeding CO2 again until 1 hour AFTER lights come on. Boom.. that's how us sealed growers fix that problem without having to break our seal.
 
Fairytalez

Fairytalez

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Oh and also.. your choice in an Autopilot is better than a titan according to the reviews. I bought one myself. Can't wait to try it. It's supposed to be a TRUE set it and forget it style controller.
 
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