Nopoleon furnaces 6700 & 6600

[Chester17]

Has anyone had experience with either the 6700 or 6600 series Napoleon gas furnaces?
40k or 60k.
Thanks

[Porcupinepuffer]

You sure you don't mean 9600 and 9700? I've installed plenty several times and find them to be a very nicely built unit. In terms of longevity and problems, I have no idea. I don't service them and can't say I've heard of any complaints.