Smokin' in the temperature chamber room...

The past couple of days, I have had the utterly enjoyable experience of testing a particular product here. Required to run for many hours on end, we've been running it in an isolated temperature chamber for the past couple of days. That is until someone noted to me that it had stopped functioning.
So I went back to the temperature chamber and turned on the light. The only problem was the light didn't turn on. I went to get a co-worker and ask them what they thought, and they realized that it wasn't the light that was malfunctioning, it was that a large, thick cloud of soot had obscured the light! We opened the chamber and out came a large, billowing cloud of smoke. We had to turn on the fan and open some doors. I wonder if the device still works?
As a side note, I couldn't help but notice that the door I was opening up had a "NO SMOKING" sign on it. Hehe, I love the irony...or I would if it didn't mean more work for me!