my neighbor has a box store pellet stove he installed himself utilizing his old metal-bestos chimney he had a wood stove hooked up to previously. This morning while he was at work, I noticed a huge amount of smoke billowing from the chimney.....enough to call 911. But after a few minutes, it subsided and eventually stopped and I canceled the 911 call. I called him, and he said he forgot to fill the hopper before he left, and that it shut down automatically , according to him, it being one of its safety features. I never owned one, but this seems odd, and was wondering if it's normal? It was like when you throw a bucket of water on a campfire. Thanks......