Members, hoping for some advice. I heat with wood using a wood furnace in the basement. My flue goes through the cinder block wall and then is insulated pipe along the outside of the house up past the roof. I am now going to install a wood cookstove on the first floor of my house, directly above the furnace. I would love to run my flue from the cookstove out the wall of the house and into a "T" (which I would install) in the already existing furnace flue. Can this be done. Some have said yes and some have said no. Would love to hear from others. I would hate to have to buy another 20 ft. of insulated pipe and have two pipes running side by side up over the roof.