As I start the great replacement insert hunt one of the things I notice is that the non-cat stoves have all manner of ceramic blankets, refractory this and that or whatever in the baffle systems to retain hear for secondary burn. And some of them admit that the stuff is gonna crap out at some point. They probably all should admit it. Question is how long do these various and sundries last and, given that they are all proprietrary, could a person be looking at more expense than the after market cats on the market today to replace them? Every body has talked about the cost of cat replacement for twenty years but, at a hundred or so a pop for aftermarket these days, are they cheaper to replace than the non-cat consumables?