Help! with my closed-room-setup issues..

[Avinash.miles]

^^^ greyskull maybe onto something, off gassing plastic, but that would cause harm to plants foliage more than roots i believe.
u def dont need intake or exhaust in a closed room, or u arent running a closed room....
im sure that makes sense

 

[ender87i]

I agree that i shouldnt need any kind of intake or exhaust in my closed room setup, because i already have CO2, a cooled room, air circulation fans, and a well-aerated reservoir.. So theres no need for any intake or exhaust or air-exchange of any kind..

But i keep getting mixed answers..
Some people say i need to exhaust at night,
Some people say i need to exchange air at night for the plants to breathe,
Some people say i dont need to do anything.

So im still wondering weather or not any kind of air intake or exhaust (just at night even) is needed, or would be a good idea..

 

[deacon1503]

a pic of ur specific issue would help us tremendously...

 

[ender87i]

My issue is irrelevant at this point, im starting over regardless.
What really matters is weather or not i should be exchanging air at night..?
And if youre about to reply and say yes, GIVE a scientific reason why.

 

[blaze02]

yes, exchange at night, and even during the day IMO>.

I've had these issues myself and im pretty sure it is ethylene poisoning (plus sulfur dioxide). This makes sense because the molecule is to small to be scrubbed by recirculating filters.

When the co2 burner comes on in a tightly sealed room, oxygen is depleted. Small plants are unable to make up for the depletion and can't maintain oxygen levels at atmospheric levels (20.4%). With low oxygen incomplete burning of propane may occur causing ethylene and sulfur dioxide to be produced.

In a totally sealed room, their is no room for any combustion by-products besides co2+heat+water vapor. Just because you can breath does not mean oxygen is high enough for 100% combustion.

"Without enough oxygen, complete combustion does not occur. This results in dangerous levels of ethylene, sulfur dioxide, and other gases. Without fresh air, burners shut off when oxygen levels are ≤ 18.9%. Humans begin to experience discomfort at ≤17%oxygen.Oxygen can become depleted in 2 to 3 hours and lead to incomplete combustion when there is no venting and cold night temperatures require continual heater operation (Bartok, 1992)."

That quote is from this article, which is an interesting read for anyone experiencing sealed room issues...
http://www.hort.cornell.edu/mattson/leatherwood/

And,,
http://www.greenhousegrower.com/article/19876/ethylene-in-the-greenhouse

hope this helps..

 

[ender87i]

You say even during the day, but that contradicts the idea behind a CLOSED-room setup thats getting CO2 enrichment. It would waste your CO2 completely. By the way im not using a burner for CO2, im using pure CO2 from tanks with a regulator. So it does NOT consume any oxygen. Only produces CO2 which is routed into the room with a small air hose and attached to the back of an oscillating fan.

Again, im enriching the room with CO2 via a pure CO2 tank, and my reservoir is very WELL-aerated.. I have my temps and humidity under control, and plenty of circulation fans within the room..

So with that said, why would i need any kind of intake or exhaust, at ANY part of the day or night?

 

[AzGrOw-N-sMoKe]

If your getting rot an its not from the water being to warm, then its from your nutes... you should be running a dead rez meaning not to run any bacteria or enzymes these add to the chances of getting rot an if your doing rez changes regularly then those products arnt even being utilized as it takes weeks for good bacteria to propagate the roots.... basically anything that causes your rez to foam shouldnt be added.... also any equipment that was in use with the rot will need to be thoroughly cleaned with bleach or thrown out or youll be continuing to fight the rot forever.... adding 3 ml per gal h2o2 will keep your rez dead, need the good stuff from the hydro shop, non of that walgreens 3%.... Az

 

[medicalmj]

My issue is irrelevant at this point, im starting over regardless.
What really matters is weather or not i should be exchanging air at night..?
And if youre about to reply and say yes, GIVE a scientific reason why.

First, I skimmed the thread and am only answering this specific question without context, sorry for not thoroughly reading whole thread.

Yes.

The reason I always exhaust at night is simple, its the easiest and cheapest way to remove water from the air. As you know when temps drop RH goes up, water will condensate on your buds, not good if it get cool.

No need for co2 at night, so instead of a closed system in which you have a/c to reduce RH and keep cool (need closed system cause you wanna keep co2 in the room). You dont need, or want a/c night as it will be much cooler anyway(no lights) so you'll have to run a dehum. at 600w or an exhaust fan at 100w. Downside only is running duct out, lil time and a couple bucks.

 

[TURBD]

No you don't need to vent at all. Day or night.
Ran this way for a long time with no issues.
Try turning your co2 off a couple hrs before lights out to use up what's in the room so you don't have your lvls get too high when the plants shit out a bunch during lights out.

Don't over look the small things.
When was the last time you calibrated your ph meter?

 

[medicalmj]

No you don't need to vent at all. Day or night.
Ran this way for a long time with no issues.
Try turning your co2 off a couple hrs before lights out to use up what's in the room so you don't have your lvls get too high when the plants shit out a bunch during lights out.

Don't over look the small things.
When was the last time you calibrated your ph meter?

What about RH? When lights go off there's a lot of water in the air that will condensate.

 

[TURBD]

That's what a dehumidifier is for.

 

[TribalSeeds]

Oh shit dude! Werent you the dude we tried to talk out of enzymes and bacteria cuz it would end up in this mess? Sorry bro! That musta been costly

 

[blaze02]

you can use bacteria and enzymes at the same time.

 

[medicalmj]

That's what a dehumidifier is for.

The question was why would one run a exhaust fan at night.

You missed the part where I was comparing them. 100 watts versus 600 watts.

And I have a dehumid in my room, and an exhaust fan. Saves money keeps heat down.