Posted by andy r on November 29, 2022 at 19:14:43 from (208.126.193.44):
I bought a Mr. Heater Big Max 50,000 btu garage heater for my winter time small projects work area. Have a few JD carburetors and planter units to do this winter. Reviews on youtube are generally positive. My problem centers around the exhaust venting. I should say I am venting hortizontally. The Mr. Heater company wants owners to use the single wall stainless steel exhaust venting. Besides being non corrosive the joints are sealed with high temperature gaskets. I have sort of come to the conclusion that this due to 1) the exhaust is corrosive and there is moisture produced in the pipe, and 2) the furnace has a exhaust inducer which could possibly leak exhaust gas into the work area as the two wall class B galvanized vent pipes could leak with the positive pressure created by the inducer. My problem is that I don't like the stainless steel pipe. It doesn't fit through the wall thimble well at all. There is quite a gap between the outside of the pipe and the thimble. I am not talking about the air space or gap inside the thimble - just how the pipe slides through the thimble. Secondly, there are not the options on the shelf. With the class B double wall you can find just about anything like the part that swivels on each end to make any degree or angle. Lastly, the price is about 3 times higher for stainless steel. I think double wall would be safer going through the thimble as well since the outter pipe temperature should be less. I know people are venting these furnaces with double wall. In fact on Youtube several show how they are using the galvanized double wall. Like I said before, I think it is mostly about corrosion and not leaking exhaust fumes. Anyone have personal experience with this? I guess it was OK a few years ago to use the galvanized double wall hortizontally and the code changed. It is still OK to use it for vertical vents. I guess I sort of feel like if it is inspected annually for corrosion and there are no restrictions in the pipe or outlet it is probably OK. But, I do generally go by the book and safety is important to me. Ideas appreciated.
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