what is the max safe temp with c02

i have 120 x 120 grow tent , my crop is 3 wk old and are 10 to 20" only prob iam having is temp , its ok leaving the door open around 75 , when i close door can reach 90 i have a fan putting co2 in , i havnt put a fan on my filter yet iam using 600w maxibright , whats a safe temp with co2 going in ?

some people run as high as 100, but really shouldn't go above 90 from what i've read

I would try to get it to like 80 though dont want to over heat your plants on a hot day or something like that

ive been reading all different its my first grow just want to be on the safe side

80 degrees F is good. Higher temps could result in mite infestations.

In order to utilize 1500 PPM of CO2 your temps will need to be above 85. Jorge Cervantes is quoted as saying 95 is the upper threshold of temperature in a CO2 supplemented room, but still that's a little on the hot side. Any less than 85 and you won't be utilizing all of the CO2 though. We run 85-88 throughout the entire flower cycle with 45-55% RH and have no mite, mold, or any other issues.

If you do not have a PPM meter then there's no use in talking about "safe temps with CO2" because you don't know your levels.

I use CO2 in a grow room that is usually no cooler than 85 degrees. It helps tremendously. It has allowed a high temp grow to flourish basically. Lots of airflow in the grow room and especially in the tent/cab/grow area helps a lot too IMHO.

That's it, air flow is key as your co2 is heavier and has to be forced off the floor. I have a fan with vent tube blowing the hot canopy air under the table in an attempt to keep the atmosphere in the room well mixed as well as small circulating fans. I vent my exhaust from the top of the room. Prior to the lights going out all the added co2 has to be vented and replace with normal air or o2 enriched air...

enriched air? as in 22% or higher oxygen levels? whats the benefits?

It's a co2 thread. You'll have to open an o2 thread.

bird mcbride said:

That's it, air flow is key as your co2 is heavier and has to be forced off the floor. I have a fan with vent tube blowing the hot canopy air under the table in an attempt to keep the atmosphere in the room well mixed as well as small circulating fans. I vent my exhaust from the top of the room. Prior to the lights going out all the added co2 has to be vented and replace with normal air or o2 enriched air...

Click to expand...

just tell me what the benefits are in venting out the CO2 and replacing it with enriched air ( air that is more than 21% oxygen )
if you can't answer the question then don't make the post -

In other words turn your Co2 making off prior to lights out.

Sometimes I forget to take my Co2 bottle out of the grow room at night but it is not so bad as long as I don't shake it just before lights out.