Art wrote:
Was it always left open when the fire was on? It should be. Only ceramic
glass can handle the heat of a closed fireplace.




Who leaves the doors open? That's not only dangerous, but it prevents
the fireplace from doing useful heating. The glass can shatter, it
happens as this one did, but is rare. My grandmother's wood stove glass
shattered once, but it had worked fine for over a decade and the
replacement glass has been fine for around 15 years since that happened.