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.
How long does a furnace last on average? Heat exchangers in forced-air furnaces have an average age of 15 years, but they can last anywhere between 13 and 22 years depending on a number of factors.The number normally varies between that range due to various models, makes and qualities available in the market.eat exchangers in forced-air furnaces have an average age of 15 years, but they can last anywhere between 13 and 22 years depending on a number of factors.