Sealed Room Question

L

Lordgenin

Well-Known Member
Hello Everyone

So I have a sealed room. When lights are on, c02 hold at a steady 1500 ppm.
Once the lights are off the C02 levels drop (Co2 does not run when lights are off)
I have a 50lb tank and it is not using a lot of c02 in my opinion.

In my mind, I would think if my room is @ 1500 ppm right before lights off. Returning it like a 4 hr time frame (light still off) my C02 level shouldn't drop to 600 ppm.
I think my room is not as sealed as I assumed or maybe I am overthinking.

Second question If my room is not as sealed as I assumed, what can I use to find drafts/ where the leak is for the room.

Little info: The room is fully insulated and drywalled and mud then I wrapped the room in Panda film except for the ceiling.

Thanks for your opinion
 
I wish I had that problem. I'm installing intake/exhaust fans just for lights out so I can get the c02 out of the room.
 
SourDeezz said:
I wish I had that problem. I'm installing intake/exhaust fans just for lights out so I can get the c02 out of the room.
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Why would you want to do that?
I know C02 is not useable to plants at night time but at least you know when your lights do turn back on you don't have to dump a lot of co2 in the room if you are using a tank or heat to the room too much if you're using a burner.
 
I have always noticed in a sealed room the CO2 PPM rises when the lights are off because the plants put out CO2 in the dark. If the levels drop then you have a lot of leakage thats wasting your tank when the lights are on.
 
SourDeezz said:
I'm installing intake/exhaust fans just for lights out so I can get the c02 out of the room.
Click to expand...
I think having a ventilation system to run for a little bit at lights out can be beneficial as it removes any potential ehtylene gas buildups in the room. I wouldn't however see a need to vent out the CO2 in the dark period.
 
Renfro said:
I think having a ventilation system to run for a little bit at lights out can be beneficial as it removes any potential ehtylene gas buildups in the room. I wouldn't however see a need to vent out the CO2 in the dark period.
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Yeah sorry, that's what I meant. Going to have the fans run on a timer for about 15 mins after lights out.
 
SourDeezz said:
Yeah sorry, that's what I meant. Going to have the fans run on a timer for about 15 mins after lights out.
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RH% tends to spike for the first 15 - 30 minutes after lights out so the vent cycle can also help with that provided the intake air isn't too soggy.
 
SourDeezz said:
Yeah sorry, that's what I meant. Going to have the fans run on a timer for about 15 mins after lights out.
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I run an exhaust for 45 mins after lights out to control RH spikes and Ehtylene gas buildup. Also have the ability to turn it on remotely if my dehu takes a crap (which it has!)
 
sf_frankie said:
I run an exhaust for 45 mins after lights out to control RH spikes and Ehtylene gas buildup. Also have the ability to turn it on remotely if my dehu takes a crap (which it has!)
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I didn't know about that Ethylene gas buildup was a possible thing. I have an Oversized dehu in my sealed room with a 3ton AC so I do not have that Spike when the light turns off.

I stay at a constant 65% RH @ 85F
 
Lordgenin said:
I didn't know about that Ethylene gas buildup was a possible thing. I have an Oversized dehu in my sealed room with a 3ton AC so I do not have that Spike when the light turns off.

I stay at a constant 65% RH @ 85F
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Are you in Veg or flower? If flowering you should drop your RH a bit to get your VPD dialed in. 85F should be around 58% RH
 
sf_frankie said:
Are you in Veg or flower? If flowering you should drop your RH a bit to get your VPD dialed in. 85F should be around 58% RH
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I am in flower
The chart that I viewed stated 65% RH for correct VPD.
This is where I don't have a pulse One yet but will get one soon to actually see that the leaf temp is under the light to get more accurate VPD.
@sf_frankie Could you tell me what chart or where you are getting that info?
This is where I got my info from: https://pulsegrow.com/blogs/learn/vpd
They state: " The ideal VPD for the flower stage is closer to the top end of the range, 1.2kPa – 1.5kPa. "
With there VPD calu
I am at a:

VPD Air (kPa) 1.46
VPD Leaf (kPa) 1.20
Leaf temp offset -/+ -2F
 
Lordgenin said:
I am in flower
The chart that I viewed stated 65% RH for correct VPD.
This is where I don't have a pulse One yet but will get one soon to actually see that the leaf temp is under the light to get more accurate VPD.
@sf_frankie Could you tell me what chart or where you are getting that info?
This is where I got my info from: https://pulsegrow.com/blogs/learn/vpd
They state: " The ideal VPD for the flower stage is closer to the top end of the range, 1.2kPa – 1.5kPa. "
With there VPD calu
I am at a:

VPD Air (kPa) 1.46
VPD Leaf (kPa) 1.20
Leaf temp offset -/+ -2F
Click to expand...

I use this one. It’s kind of annoying that none of them are consistent https://docs.google.com/spreadsheets/d/1M9jGhBA0lc2S8NEsq3q_6Mkpd3yJwedSZ3kfxuK0ZVI/edit
 
@sf_frankie I see, well I will meet in the middle and go with 61% with a 2% swing.

Thank you for the info, Now I just need to figure out this leak.

Actually I change my mind I will try 58% I am kind of scared of high RH.

Will watch and see if there is any difference
 
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I have mine set to 1200ppm max and kicks in if it drops below 1000. My co2 regulator is connected to my co2 controller. when lights turn on for me when i walk in the room its in 1000s already. I do not vent out.
 
is it possible u set ventilation on when lights off n then off when the co2 is blasting ? will the humid go up?
 
rizatk said:
is it possible u set ventilation on when lights off n then off when the co2 is blasting ? will the humid go up?
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I vent during lights out. Humidity stays stable thanks to my dehumidifier. When I’m venting the humidity drops a bit and then the humidifier shuts itself off.
 
Chances are your only place not sealed is around your door. However based on what you've mentioned it doesn't sound like you have much of a leak. Caulk around all door trim, really everything that's not taped and mudded, and get some foam weatherstripping if your door isn't tight. I don't ventilate my room at night like some do. I have no problems. I use a dehumidifier, which I believe is essential in a sealed room.
 
ChrispyCritter said:
Chances are your only place not sealed is around your door. However based on what you've mentioned it doesn't sound like you have much of a leak. Caulk around all door trim, really everything that's not taped and mudded, and get some foam weatherstripping if your door isn't tight. I don't ventilate my room at night like some do. I have no problems. I use a dehumidifier, which I believe is essential in a sealed room.
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Dehu is a must for sure! Mine crashed one day and it didn’t take long for the humidity to spiral out of control. Thankfully I have an emergency fan I can switch on remotely to vent to keep it under control.
 
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