Susan mentioned the other day that one of the seals had come off the door of our new fire. I think I have worked out the culprit. I think it's me.
We hardly ever have the fire running at full power, which means that although the wood still burns down completely, it doesn't burn quite as cleanly as it can. When we shut the fire down, we get slightly more smoke, and the glass on the door gets dirty. A period of really hot running soon burns this off, but most of the dirtying of the glass happens after we shut the fire down for overnight, and rarely do we reload the fire next morning.
To keep out fire looking sparkly new, I clean the glass with a produit especially designed for the task. Unfortunately, I think I might have been using it too liberally, and it has run down the glass and dissolved the glue on the seal.
The seal I replaced can been seen just below
the clip holding the glass onto the door.
*Susan snorted (rather unkindly, I thought) when reading this sentence.