Hey JohnDoe,
You say you have a gas line run into your flowering room. Does it stub into the room with a cap on it? Also what size is the pipe? What size gas line does the CO2 burner you want to use require? Most likely 1/2" IPS (iron pipe size). The reason I am asking this is, it is possible to tie on to the line in your flower room with a tee, one line to your veg room and the other to your flower room. I am a licensed plumber (not a drain cleaner) and if you like I could walk you through the process. It is alot easier than you might think. Natural gas is alot cheaper and much more convenient to use. Imagine never having to refill tanks again.