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.
Oil Furnace Service Life. Many oil furnace manufacturers offer a 10-year warranty, but this doesnât always indicate the actual lifespan of the furnace. The average life expectancy for a properly maintained oil furnace is usually 15 to 20 years. Some furnaces may last as long as 25 years. The key to efficient operation of your oil furnace is annual maintenance by a certified HVAC technician.