The DOAS fan unit is a new air adjustment device to provide fresh air. It could be Constant temperature and humidity or simply provide fresh air accordingly to the environment requirements. The principle is to extract the fresh air from the outdoor after remove the dust, humidity, or high or lower the temperature, and replace the interior air.

With the improvement of living standards, people are with high requirements on the air conditioner, the temperature can not meet the requirements any more, it is more significant that people have individual demands to the environment. Conventional central air conditioner only plays the cooling and heating function, and it cannot improve and control the indoor environment.

YongQian Energy Saving Technology Co., Ltd devotes to the research and development for the central air conditioner at the end, and it is the only professional factory which produces purfication at the end in China. Currently the purification fan coil has been updated to seventh generation, and it could adsorb smoke, sterilize bacteria, purify air, it is very healthy and environmental. Also we have won the patent from the national patent bureau. It becomes an iconic appliances in luxury apartment, villa, hospital, office and entertainment venue and so on. It would spread to thousands of households!