Recent news feature about a lady here in North Carolina have her refrigerator EXPLODE! Google "Exploding Refrigerator" for a couple videos showing damage done by explosions. Newer refrigerators use R-600 for coolant. R-600 is Butane. Explosive as he77 in the right proportions with oxygen, but it doesn't damage the atmosphere. Some leakage inside cabinet, and any spark can be a disaster! Yes, I know that submarines has used it as a coolant for years.