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.
The answer to this question depends on a variety of factors and you will need to examine them carefully. Typically, a forced-air gas furnace can be expected to last from 15 to 20 years.Some experts give a range of 13 to 25 years, because there are many variables. For example, some home builders use lower quality units made by well-known manufacturers.ypically a forced-air heat exchanger can be expected to last between 15 and 20 years. Ultimately, heat exchangers fail because of the constant heating and cooling.