Newly mandated safety standards governing gas-fired residential water heaters took effect in July 2003, and provided supplier A. O. Smith Water Products Co., Ashland City, TN, with an opportunity to design a product line built on new technology. The company's C3 Technology gas water heaters, engineered to meet the new standards, feature a sealed combustion chamber with an air inlet, where air flows through a perforated-steel corderite flame arrestor. They also include a removable air-intake screen for filtering airborne lint, dust and oil, while providing air for the combustion chamber, and a thermal cutoff device to shut off gas flow during a flammable vapor ignition or excessive internal temperatures.
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机译：新的强制性天然气家用热水器安全标准于2003年7月生效，为田纳西州阿什兰市的供应商A. O. Smith水产品公司提供了设计基于新技术的产品线的机会。该公司的C3 Technology燃气热水器经过专门设计，可以满足新标准的要求，其特点是带有带进气口的密封燃烧室，空气流经穿孔的堇青石钢制阻火器。它们还包括一个可移动的进气滤网，用于过滤空气中的棉绒，灰尘和油，同时为燃烧室提供空气;以及一个热切断装置，用于在易燃蒸气着火或内部温度过高时切断气流。
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