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.
cmorbud Reviewed by cmorbud on . 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 Rating: 5