After I posted last night I read the Class B flue pipe (double wall, outside is galvanized/aluminum on the inside) installation booklet that I picked up at Menards yesterday. I could probably use the double wall, but it is totally outside of any and all codes for a hortizontal application. According to the pipe company booklet there can not be an inducer on the furnace as it can cause a positive pressure in the vent which could leak into the work/living space. An inducer could be added to the hortizontal vent, but it would have to be located at the outlet which would cause a negative pressure on the vent which is OK. Looks to me like this double wall pipe is to be used primarily on furnaces or water heaters with an exhaust hood where all of the exhaust gasses collect which a vertical vent is attached. The Mr. Heater Big Max heaters are 80% efficient which probably means the exhaust temperatures are fairly high. As soon as the exhaust leaves the furnace it cools quickly causing the condensation. Condensation must be fairly high as they even sell a section of pipe to drain the water away. According to Mr. Heater they want the vent pipe to ever so slightly go up hill leaving the furnace and going through the wall. I guess this is to expose the condensate to higher heat to vaporize it and push it out the terminal end. Remember I want to use a hortizontal vent. You can use class B double wall with a vertical vent for this furnace, but sounds like not with a hortizontal vent. I guess I am thinking of keeping my stainless steel special gas vent with the EZ seal gaskets.
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