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Make sure to bump this thread when the tech looks the system over. I'd be curious to know what they find. I have to stick with the duct system being hosed since the furnace will work without the blower door on. I wonder if the drop duct that comes from the crawl back at the back of the furnace has that same insulation it in that the brilliant piece of duct fabrication pictured in post #62 has.
Only thing I think the altitude will affect is the size of the propane orifices used to convert the furnace. But I'm a lowlander so I can't say for sure.
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Nick
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