ok, I've been reading this...
http://cannabisculture.com/articles/1804.html...about getting CO2 in your grow room & it was saying somthing about running duct work from a nat.gas or propain applyance...well, let me just paist it here...Recycled CO2
A source of recycled CO2 may be found in any natural gas or propane appliance, especially those with a pilot light. All such appliances produce CO2, when properly functioning, that is. A simple rule of thumb is: blue flame = CO2 or what we want, yellow flame = CO or carbon monoxide, deadly poisonous! It is merely a question of how to get the CO2 gas from the appliance to the grow room. If the appliance (furnace, hot water heater, stove, etc.) is anywhere near the grow room, then a simple duct system of dryer vent tubing running from the bottom of the appliance (remember, CO2 is heavier than air) to the grow room will suffice. A muffin fan placed on the room end of the tube, blowing into the room, would efficiently move the gas.... it just so happens that my "gas"hot water heater is less than 8' away from the outer wall of my grow room, WOW how cool is that

it should'nt take much wrk.or $ at all to make this CO2 thing happen. I could even put the computer fan (which I just so happen to have an old comp.)on a timer to give me some control over it...What do y'all think
