CO2 from Nat gas???

ive read in the FAQs that extra CO2 is a really good way to get plants growing. i was wondering if the CO2 from burning Nat gas is a good way to get that extra lil kick. the reason i ask is cuz im starting a new grow cabnet in my closet that is right next to the water heater. i can duct the exhauast from the water heater into the cabnet then back out though the roof over the water heater. thata way i can get rid of the smell and give CO2. my cabnet is completely sealed, so im sure i wouldnt get CO2 out in the room or anything. the heat is not a prob. eithor as i has an exhaust fan that rocks. lol anyway, what do yall think???any unforseen probs i might run into or anything

Other then the heat from the water heater.
It sounds like a great idea.
CO2 generators use natural gas to produce co2 or Propain.
But I don't see why you couldn't use the water heater/.
As long as that air isn't too hot.

man i dont know,spent many years in the construction trades.
gas water heaters are vented the way they are for a reason.
screwing with these things not genraly a good idea.
be carfull for what your messing with could kill you.not a pleasent thought.
well good luck what ever you do.

The CO² is not in the exhaust. It's a by product of the blue flame. It falls down from the tip of the flame to the ground. CO² is lighter then the air so it will fall to the ground and fill the room from the bottom up.

thanx for all the feed back. ive done a few ajustments to my cabnet so i get all the CO2 i can outa the heater i ran some new ducting, the wieght of CO2 is only slightly higher than just reg air. air, dry 1.2929, carbon dioxide 1.977 in the water heater runs a constant vaccuum of -0.02" on just pilot n -0.12" at full flame. so that should be more than enough to pull the CO2 up n out the exhaust. i turned the heater off and just ran the fan and it pulled a constant of -0.10" on high and -0.08" on low. if any of my math or anything else looks alil off please feel free to let me know.ill post some pics some of the set-up so any feed back is more than welcome. thanx