2, cleaning services program air system: 2.1 Air Systems Cleaning reason: Most commonly used in central air-conditioning systems coarse filter, air filter out up to 40 percent of respirable particulate matter, more than half of respirable particulate matter will enter central air conditioning system. On the one hand, these respirable particulate matter may become carriers of the virus, the virus in the air duct flow propagation, resulting in cross-infection; the other refrigeration equipment maintenance, small particles of respirable particulate matter interconnected become a big dust used refrigeration equipment, has accumulated At the bottom and corners of the wind pipe, over the edge breeding microorganisms (such as Legionella). Wind systems exist with these viruses and microbes ease of duct was sent around the room, will cause secondary pollution of indoor air, which people live and work environment and long-term harm to refrigeration plant, causing productivity drop, and prone to respiratory diseases. Therefore, it is necessary to periodically conduct a thorough cleaning and disinfection of air system work. Third, the various types of equipment maintenance work: all kinds of air conditioning and refrigeration equipment like cars, require regular maintenance, service, otherwise it will cause the device to malfunction and shorten life, affecting the normal operation of the system. Major equipment maintenance includes the following contents: ① chiller maintenance: three filters, replacement of wearing parts, control systems and other adjustments. ② cooling tower maintenance: cleaning the tower and packing, maintenance of motor fuel, belt replacement. _ Snow Dragon refrigeration plant refrigeration (certified) _ refrigeration equipment provided by the Dongguan City-long Refrigeration Electrical and Mechanical Equipment Engineering Co., Dongguan City-long Refrigeration Electrical Equipment Engineering Co., Ltd. (www.dgxuelong.com) is Dongguan, heat, refrigeration and air conditioning equipment leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, the maximum meet customer needs. In the Snow Dragon refrigeration leadership with the staff warmly welcome all inquiries negotiations to create a better future XUELONG refrigeration.