How hot before CO2 is a must

dertmagert said:

is it? i havent given any co2 in the dark cycle but i was actually planning on it because when the lights are on in my room the exhaust is on too.. as well as 2 other fans for circulation.. my exhaust is very heavy for the room its in so i was just trying to find a way to get the co2 to stay in the room long enough for the plants to use it instead of having it instantly whisked away by a over zealous blower! hmm.. back to the drawing board

on another note, i was also wondering if i should be running my fans while the light is off... i havent.. i have my light and all my fans on the same timer.. i wonder if thats a problem..

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i feel like if there isnt any light, there isnt any photosynthesis..... so why use co2 if the plants arent going to use that much co2 in the night anyway?

you should always be pumping air in and air out even in the night cycle. when you turn off fans, you are leaving stale air inside. Leaving an open invitation to pest, mold disease all that shit. If its one thing that pest and mold cant stand is fresh air..... as they cant hold on while air is being blown and sucked as well as other things!

i see.. im gonna go head and fix that now.. thx

I know that flue gas is a poison and the by-product of incomplete combustion of burning natural gas and propane is is Carbon Monoxide which will kill you. People go to sleep every winter and never wake up from poorly maintained gas furnaces and appliances putting out CO not CO2. The flue pipe is there for a reason and that is to vent poison flue gas out of your home so you will not be poisoned and dye in your sleep or make you ill. Venting flue gas in your house is like closing your garage door while your car is running. You might as well attach a hose to the tail pipe of your car and run it in your grow room for CARBON MONOXIDE not CARBON DIOXIDE. There is a BIG difference. Log term exposure to CO will cause dizziness, headaches, fatigue, vomiting and even DEATH. An Ounce of Prevention. I have seen CO2 generators but they can be very dangerous if not maintained and used properly. They are designed for that purpose and mainly for out door green houses. Your hot water heater IS NOT designed to produce CO2 for a grow room. Gas CO2 generators will produce CO2 as long as the burner has a blue burning flame. Once the burners get dirty the gas can no longer burn properly they will put out CO which is a by product of incomplete combustion of the gas.

LoudBlunts said:

i feel like if there isnt any light, there isnt any photosynthesis..... so why use co2 if the plants arent going to use that much co2 in the night anyway?

you should always be pumping air in and air out even in the night cycle. when you turn off fans, you are leaving stale air inside. Leaving an open invitation to pest, mold disease all that shit. If its one thing that pest and mold cant stand is fresh air..... as they cant hold on while air is being blown and sucked as well as other things!

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I am in a similar situation. I have a 3'x3'x63" Homebox with a 400w Super HPS and a 6" exhaust fan and a small 6" fan on a clamp and a C02 kit. The space runs between 85-90F. My plants are not ready for flowering yet so i have been playing with the room to see the best way to lower my temps. I am going to get 3 more small 6" fans to circulate more air to try to lower the temps. I haven't been running the AC in my house much since the weather has still been cool. I think i am going to run the CO2 cycle at the beginning and before the end of the light cycle and put the fans and exhaust on a separate timer. I will probally run one CO2 cycle at night as well. I am considering buying a environmental control if i can find a reasonably priced one.

75-78 is ideal temps with no co2.Temps should be 80-85 max for co2. All temps over 85 start to reduce yield and stunt the plants growth and potency. You need to keep co2 ppm at 1200-1500 all lights on period with a fresh air exchange every 2 hours or the plants will suffer or if to low wont get the benefits

stickyicky77 said:

An Ounce of Prevention.

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Im not ignorant about carbon monoxide poisoning nor am i in a rush to wildly reccomend something deadly,obviously co2 burners are designed to be ran outdoors but we all know they are not,many are ran indoors in vented rooms with zero harmfull effects IF the room is vented properly,which anybody thinking of using any form of co2 should be smart enough to realize is a must,even if the co2 comes from inert gas instead of combustion.

In order to know exactly what the difference in exhaust gas & its contents are you can do some simple research,request a msds sheet from GE on their natural gas water heaters & request the same msds sheet on any co2 burner of your choice.You'll find out that both are very close in what levels of co & co2 they produce as long as the btu output of both devices are very close,modern day water heaters are very similar to vent free gas/propane heaters in fuel burn effeciency,not to be confused with furnace exhaust gass'es.

You can also request a schematic from both manufacturers,once again you'll find they both run on the same principal & same basic design,there is nothing all that special about a co2 burner,if allowed to operate with dirty orifices both units will put out dangerous levels of co & soot.

There's no majic with a co2 burner,same principal.

My room runs at 85 degrees constant give or take a degree. And never had problems. I would start to worry if it got 90 degrees & over though.

i second that^^^^

As long as i run my 6" exhaust fan on the high speed which is about 225 cfm and one 6" fan to circulate the air the space stays between 80-87 F. I plan to add a few more fans for better circulation and hook up a attic fan thermostat to my exhaust fan. I will be able to cycle the exhaust from high and low speed depending on the temp in the space with the thermostat hooked up in parallel to my exhaust fan with a speed controller. This should control the temps very well. I am going to experiment with the temps and see how long it will take to get the room to a dangerous temp with the exhaust fan off for the CO2 cycle. That way i will know how long of a CO2 cycle i can run safely and how many i should set up. I am also thinking about just running three 1hr CO2 cycles a day with the exaust runnning if it stays on low speed most of the time.

I'm having a similar issue.

I've got the homebox clonebox (4 x 2 x 4) and a 234 watt, 18000 lumens T5. With a 100cfm exhaust fan and a 60 cfm intake my ambient temps sit between 85-88F.

I don't have the moolah for c02 or any of that craziness atm, so I'm trying to figure out what to do to lower the temps.

Good luck, mane.

yeah i have a simular issue. 270 cfm can fan hooked up to a small grow tent in my closet (2.5x3x5.5) just got a co2 system last night. im running 24/0 lighting and exhaust. no idea even where to set how much co2 to release without a meter; but im not down to drop 300 on one. so does anyone have any suggestions at all? grow room is being vented through filter-duct-light-duct-fan-exhaust and have 1 oscillating fan in there. my temps dont get above 83 without the ac on but i've read co2 helps growth by a ton. please help

i'd wait til flower. you'd jus be wasting gas, imo!

LoudBlunts said:

i'd wait til flower. you'd jus be wasting gas, imo!

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so you're saying i wont see a difference running co2 during veg vs. using it during veg?
new to this co2 shit so any help would be great! if its pointless running during veg ill just wait a few weeks till flowering time

the whole point of co2 is to increase growth right?

well my thinking is that you cant rush puberty. thas the only reason we veg right? to get to sexual maturity than flip the lights to bud right?

well with that said....if you cant rush puberty & maturity..... what makes you think co2 can? get my drift???

Regarding the discussion above of CO vs CO2 -- it is true that poorly maintained CO2 generators can put out some CO as well. If you're using a propane or natural gas unit indoors I'd recommend getting an inexpensive carbon monoxide detector for the grow room.

Ace - Ace Tree: Hardware: Home Safety & Security: Carbon Monoxide Detectors: First Alert® Carbon Monoxide Detector (CO615)

Don't cheap out on safety. It's all fun and games until someone loses an eye (as it were.)

right, but with co2 and 24/0 lights the plants will grow faster. you can flower them whenever you want just by changing the light cycle. i see the benefit to using it throughout the whole grow because co2 is used in photosynthesis. if lights are on 24/0 id say they'd reach maturity/grow a ton faster. i was planning on using it for flowing but wasn't so sure about veg. i don't know though still newbie to a lot (not all) of this indoor growing. but if its not necessary then i will turn the tank/timer off and wait till flowering in a few weeks

I use co2 and I don't have the air exchange on ( room air going though the filter and than out of the room ) so i get no fresh air when the co2 is on, I thought the reason you change air in your room was to bring in new co2. So while I'm supplying the co2 out of the tank i leave the filter off so it doesn't pull in fresh air. The co2 out of the tank is on for 11 hours a day. I've been doing this for 2 or 3 weeks am I doing it wrong?