I have just acquired an old Wood Cook Stove and I have a plain wood burning stove in which I use the wood burning stove to heat my basement. The wood stove connects directly into a class A chimney. Can I tie in the old Wood Cook Stove stove pipe into the stove pipe that connects from the chimney to my wood burning stove? So it would merge stove pipe from each stove into one and that one pipe would go into the chimney. The stove pipe is 6 inch. Would connecting the two into one be a saftey issue? Thanks.