Some work for equipment manufacturers, such as the makers of heating and air conditioning systems, and they travel to installation sites to upgrade or modify those systems.
有些工作者服务于设备如电暖气和空调的制造商。他们还要出差到安装了系统的地方，为他们更新或改进已安装的系统。
Presents some kinds of air duct cleaning equipment suitable for different air conditioning systems and the technology process of air duct cleaning.
在详述工艺流程的基础上，提出这种工艺方法中影响油管清洗质量和清洗速度的主要工艺参数，以及他们之间的相互作用规律。
Has been widely used in steam boilers, hot water boilers, heat exchangers, steam condensers, air conditioning, direct gas turbine cycle and other equipment and systems supply water.
目前已广泛应用于各种蒸汽锅炉、热水锅炉、热交换器、蒸汽冷凝器、空调、直燃机等设备及系统的循环补给水中。
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