Ok, if you are using tanked Co2 just make sure you have it on a timer and I would hope you have the proper emitter/gauge to dose it out, there is a formula for measuring the proper amount based on your room area online just google search for it. There will be no carbon monoxide made from this set-up, only carbon dioxide.

If you are burning propane to produce Co2 in a "generator" then this depending on the temperature of the flame and how complete the burn is will produce carbon dioxide but the possibility exists for carbon monoxide production as well which can be fatal if built up in sufficient amount in a living area. This can kill you dead.

Carbon dioxide is found all around you in the air at an amount of around 300 ppm depending upon where you live, some places are higher/lower. Plants use carbon dioxide to power photosynthesis and the byproduct of this process is oxygen. I have actually lived somewhere that had an ambient air level of around 1500 ppm co2 (about the max you want to go for plants) and suffered no health effects other than being slightly sleepy sometimes.

The other thing about co2 is that it is heavier than air as mentioned in an above post and will accumulate if not circulated properly in the plant canopy, this can actually become toxic to plants at extreme levels in a sealed environment. (known as co2 burn) The safest bet for co2 enrichment in a small area in your living space is to use a smaller amount of co2 from a natural source that is not as highly concentrated as pure tanked co2 or as volatile as a gas co2 generator. I highly recommend the "co2boost" (found at the website of the same name) bucket that produces natural co2 from a 100% safe process of harmless mycelium growth in a medium in a bucket with a pump on top. I have heard of very good results using this system in small set-ups.

Co2 is generally considered safe for human inhalation in small amounts with no harmful effects whatsoever unless it's a very high concentration for prolonged periods of time, this is not because it's poisonous only because it replaces oxygen in the bloodstream but that would surely not be a concern using the bucket system that produces a small constant stream of natural sourced co2. I have heard of tanks leaking due to bad connections and emitters which can cause levels to rocket to very toxic levels quite fast. There are also co2 test kits and digital gauges available for monitoring levels, some are pretty expensive.

One last thing, NO Co2 during the last 2 weeks of flowering, it signifigantly delays maturity because it displaces the acetylene gas the plants produce to signal ripening of the flowers.

Hope this helps, good luck! Be safe. :thumbsup: :jointsmile:
FreeDaHerb Reviewed by FreeDaHerb on . Co2 and bedroom? I just got a co2 system and my grow setup is in my bedroom about 10 feet from where i sleep. My mattress is on the floor and the grow setup is in the closet which the door is open. Is it safe to run co2 right where im sleeping? are there any dangers or things I should worry about? Any tips or advice for this setup? I dont really want to ruin the closet door by cutting room for vents etc I want to either make this work the way my setup is or not use it. Any help would be great. Rating: 5