Hi yall its been a long while, i built a new outdoor shed for my furnace this summer and im thinking about getting on of them silicone roof flanges they have a metal ring around the bottom and are made of orange silicone the dealer says they are for hi heat applications , BUT i dont know if they know what they are talking about.. i burn a little wood in the fall and every now and then i "burn out" the creosote in the pipes and i have seen the pipes turn red before so im a little concerned about the silicone burning, anybody ever used these before???? thanks for the help and may your winter be mild