I have been wanting to add co2 to my grow room since I finished it a cpl months ago but the cash outlay kept me from doing it. Then I ran across an artical on the web titled "CO2 for FREE" written by David Oppenheimer (Great read). Simply put, he explained how you can use the exhaust gas from a natural gas hot water heater to enrich your growing area with co2 for a mere fraction of the cost of a tank system or one of those pricey co2 generators made by "CAP" or "BluOx". Since my water heater is about 10' from my grow room this worked out great for me. All I did was place a "T" in the exhaust line exiting the top of the heater. I then ran a 4" metal duct (not that flimsey 4" dryer duct) into my grow room. Once inside my grow room I continued it to a bathroom exhaust fan ($14.00 at Loews) I built into a box and attached to the wall. You can use a 4" inline booster fan but I would have had to order it online from Loews or HD .The exit side is a 3" duct fitting that I attached a 90 degree elbow to and directed the flow of exhaust gas (CO2) behind a 16" oscilating fan that I mounted close to the ceiling. The fan disperses the co2 over my entire grow area for complete co2 saturation.

Before I installed my "Ghetto Generator" my co2 ppm in my sealed grow room ranged from 400 - 500 ppm. After the instalation it measured 3000 ppm WAAAAY to high. And since I don't have one of those co2 monitors like a CAP1/2 or 3 I had to dial my Ghetto Generator"in with a $17.00 timer. After trial and error I got it to keep a constant 1500 -1900 ppm with lights on by setting my timer at 15 min on and 30 min off. I also installed a Carbon Monoxide alarm to be on the safe side....Total cost was around $80.00 and install time ran 3-4 hours.

I run 4 x 1000w HPS lights in cool tubes vented into the attic w/ an 800cfm inline fan drawing from outside air and the temps stay in the range of 82 to 85 degrees while venting the warm air from the water heater into the room. I do have a line from my central air running into the 8 x 12 grow room to help keep it cool also. Well anyway I hope this helps a few of yall out. Here are a few more specs on my grow-op.

Room Size is 8 x 12

Set up two ebb & flow tables that are 3 x 8, one on each side of the room. Each table has eighty 3" netpots for a total of 160 plant sites (I lollypop all my plants and they go straight from the DIY aero cloner into flower)

Ea table is covered by 2 x 1000w HPS cool tubes

Ph range is 5.8 to 6.0

Nute ppm range is kept close to 1500ppm at all times

Night time temps (lights off) is 69 to 71 degrees

Day temps w/ co2 and lights on ranges from 82 to 86 degrees.

CO2 ranges (lights on) 1500 to 1900 ppm (and is now FREEEEEEE)

Thats All Folks ...Hope this helps someone cause it sure saved me a bundle of $$$$$$

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why not make some beer or wine? or just mix sugar yeast and water? that messing with natural gas heater stuff sounds dangerous.

sorry, i didnt read your post thourougly enough. you would need to make alot of beer or wine to work in your situation. i didnt realize your room was so big, must of rushed through that part reading..

Have you measured the CO ppm???

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The Temporary Relief Assistant Trailer Park Supervisor. Carmelisous Jornl :: ElecUsageCostsCalc (now with carbon footprint) :: FloroTubeCompendium ::

I have not taken a reading as of this writing on the ppm for the carbon monoxide. For now I have a carbon monoxide audible alarm setup near the exhaust vent blower. The room is vented once every 2 hours for 15 minuits.

For the most part, the fan that pulls the co2 into the room is doing so mostly from the pilot light in the water heater which burns a steady BLUE flame which means mostly co2 and very little co. The pppm on both the co2 and co spike when the water heater is heating up the tank like when someone is takeing a shower or the little womans runs the dishwasher and levels back out when the room runs thru a venting cycle.

I just took a shower and went in and took a ppm reading on the co2 and it spiked at 2500ppm but the co alarm was quiet which means carbon Monoxide ppm are at an acceptable level.

To be on the safe side, if I plan on being in the room for more an extended period of time, I run a manual vent cycle for about 10 min prior to be safe.

i love this idea not for everone but it for me

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It it a MAJOR code violation.

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The Temporary Relief Assistant Trailer Park Supervisor. Carmelisous Jornl :: ElecUsageCostsCalc (now with carbon footprint) :: FloroTubeCompendium ::

thats a joke right
reading that and then looking at your avatar ialmost died

but you r playing right
stop it
stop it now

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So putting exhaust gases back into a living area isn't a code violation? Where do you live? Nigeria?

(I guess I am a dummy, and thought a chimney was to let the gases *out* of the living areas. Silly me, I guess the chimneys aren't needed.)

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The Temporary Relief Assistant Trailer Park Supervisor. Carmelisous Jornl :: ElecUsageCostsCalc (now with carbon footprint) :: FloroTubeCompendium ::

BBB..Exhaust gases are mainly the CO2 gases expelled from my natural gas hot water heaters pilot light and an occasional heating of the water tank The gases are drawn into a sealed 8 x 12 flower room built in my garage. Not the living area of the house. I know it is not code, but neither is a MJ grow room in ones home. I know it sounds like a disaster waiting to happen but I don't see any difference between my DIY set up and a high $$$$$$ store bought natural gas gen like Bluox,GreenAir, or CAP ect. I do take precautions and monitor CO2 and Monoxide levels constantly. Mr. Balls , you have my utmost respect for your concern as for the safety issues that one would encounter in this DIY project.