Recommended series/models: B series, C series
 
In fact, the ring was founded in 2002 can be described as a veteran enterprise in the domestic fresh air industry, mainly in the commercial field, the popularity of the consumer terminal is not very high, a few years ago began to get involved in household fresh air, and has reached strategic cooperation with many real estate developers, Shanghai World Expo, Guangzhou Asian Games and other venues have also applied Huandu products.
 
Huandu can quickly enter the household central fresh air system market, due to the deep accumulation of Huandu in the field of air heat recovery, the full heat recovery device is the most high-tech component in the fresh air industry, and is regarded as a technical barrier for high-end brands. At present, Huandu has the largest manufacturing base of fresh air heat recovery products in Asia, and has built a national enthalpy difference laboratory, and is also the only enterprise in China that has the ability to produce multiple types of heat recovery devices such as runners, plates, plate fins, heat pipes and liquid circulation at the same time.
 
All the fresh air hosts of Huandu are equipped with their own fin full heat exchanger as standard, the fin full heat exchanger adopts a layer-by-layer vertical embedding structure, which completely separates the exhaust air from the air supply to avoid cross-contamination, and each layer of the substrate is in the form of a peak wave, so as to maximize the airflow contact area and improve the energy exchange efficiency, the maximum heat exchange rate of the Huandu fresh air host can reach 82%, and the enthalpy exchange rate also reaches about 60%, and the comprehensive capacity exchange rate is at the upper middle level in the industry.
 
Huandu's household-level central fresh air system is divided into B and C series, the model naming is quite simple, the suffix number of the letter represents its maximum fresh air volume, providing 150, 250, 350m³/h three mainstream specifications are optional, B series supports APP link, and is also replaced with a more energy-saving and efficient DC motor, in addition to the C series is not much different.
 
In response to the needs of the consumer market to combat haze, Huandu is equipped with a pure physical filtration device for the host of the central fresh air system, and the entire filtration system is composed of a metal interception net, a primary filter and a PM2.5 exclusive filter, which can effectively intercept more than 95% of PM2.5 particles, but limited by the space inside the fresh air host, the volume of each filter is still relatively small and needs to be replaced regularly.
 
In addition, the factory directly under Huandu has a number of high-precision CNC machine tool production lines, the aluminum alloy shell of the host is exquisitely worked, and the sheet metal parts are tightly fitted, which effectively improves the sealing performance of the whole machine, and the ultra-thin design brings a thickness reduction of nearly 50mm, and the residential buildings with low floor height can also be installed and used.
 
At present, Huandu has opened a flagship store on the e-commerce platform, but like other brands, the central fresh air system is not sold online, because it involves a series of offline design, installation and a series of work, it is recommended that consumers can contact offline agents, the installation cost of the fresh air system in Huandu is about 10,000-15,000 yuan, which is relatively close to the people.