I bought my house a year ago which was built in 1977. It has 2 heatilator mark 123 fireplaces, 1 in the living room and 1 in the living room of the basement. I bought a quadrafire 3100i stove from a friend pretty cheap which it says it is approved for installation into a ZC fireplace. Has anyone done this before? And what do I need for stove pipe to get it into my existing chimney? I have double wall insulated flue pipe that is practically brand new