we just bought a wood stove for the people coop (aka house). this is going in the living room. when we had the room built we put in the chimney. this year we were able to get hte wood stove. we have a whole house wood stove in the basement but it doesn't heat the living room. I still need to buy the stove pipe. should I get the double wall or single ? why can't I seem to find double wall pipe in black ? any ideas