Uncooked rice often contains the bacteria Bacillus cereus. These bacteria can form protective spores that survive the cooking process and if the rice is cooled slowly (and left between 5 Â°C and 60 Â°C for a long time), these bacteria spores can germinate, grow and produce a toxin (poison) that causes vomiting.
Obviously the colder a climate is, the more a furnace is required to run, and the shorter its life expectancy. With our relatively mild climate here in Seattle and the rest of the Puget Sound, the average life expectancy for a gas furnace is 15 to 20 years if well maintained, properly installed, and properly sized.
Gravity furnaces have not been made for more than 20 years in many areas. Whenever you see one, it is probably safe to say it is close to the end of its life. Combination systems are relatively new, and since the furnace side is relatively simple, there is no reason to expect a short life expectancy.If the fan or coil in the furnace fails, it can probably be replaced without replacing the entire furnace.henever you see one, it is probably safe to say it is close to the end of its life. Combination systems are relatively new, and since the furnace side is relatively simple, there is no reason to expect a short life expectancy.