After 5 years of service, the door/glass gasket on our Napoleon NPS40 free standing pellet stove has failed the dollar bill test. Don't scream. It is frayed but it has never failed the dollar bill test until today. The stove is still burning cleanly. The glass gets dirty a little more quickly but the flame is still bright, white and active. The only reason I did the dollar bill test today is that the gasket seemed to show a lot more wear today when I cleaned the stove. The area of most visible wear actually passed the test. While I was at it, I tested the area of the gasket that showed wear earliest, the gasket right in front of the burn pot. That area failed the test. I've ordered a new gasket; it should be here in a few days. Right now we are having warmer than normal temperatures, so we aren't missing the pellet stove. It will be cold again by the middle of the week, and darned cold by this weekend. Can we use the stove safely untile we get the new gasket, as long as it's burning well?