Greetings, I'm hoping someone with a little knowledge of gas appliances can steer me in the right direction. I've currently got my hot water heater vented into my chimney and want to get it out so I can run a woodstove through the chimney. Is it safe to run the exhaust up INSIDE my drywall, through the plate and out the ceiling? Id much rather redo some drywall than run the pipe up the outside of the house. If its safe how should I insulate? I'm thinking of boxing it in with metal stud and using sprayfoam. Last question, how far can I run the exhaust horizontally before havving to turn it up through the plate without affecting its function? I really appreciate the help and hopefully once this is done I can get on with installing my damn woodstove.