Huandu has not invested much energy in the brand building of terminal consumer goods, and its popularity needs to be improved. In fact, founded in 2002, Huandu can be described as a veteran enterprise in the domestic fresh air industry, the main development direction is the field of fresh air equipment and air heat recovery, currently has the largest heat exchanger manufacturing base in Asia, built-in national heat recovery enthalpy laboratory, is the only one in China that has the ability to produce runners, plates, plate fins, liquid circulation and other types of heat recovery device enterprises, its products cover industrial, commercial, household and other fields.
 
In the household grade new fan product line, Huandu provides two types of products, wall-mounted and cabinet-type, with a self-produced full heat exchanger as standard, which is unique in the new fan market where the heat exchanger has not yet been popularized, with a maximum heat exchange rate of 82% and an enthalpy exchange rate of more than 50%, and the comprehensive performance is at the mainstream level. Different from sensible heat exchangers, which can only exchange temperature, full heat exchangers can also exchange latent heat, which can be simply understood as heat exchange caused by the process of humidity change, which is macroscopically called "exchange humidity". Therefore, the full heat exchanger can not only regulate the inlet air temperature, but also regulate the humidity change in the room to a certain extent.
 
B series is Huandu's wall-mounted fresh fan series, frankly speaking, Huandu has not invested too much energy in the wall-mounted fresh fan, B series currently has only two single products, respectively, B150 and B150 WiFi version, whether it can support APP connection is the only difference between the two. The maximum fresh air volume of B150 is 150m³/h, and the maximum applicable area is about 50 square meters, while the filtration system is relatively simple, with only two filter layers of primary HEPA high-efficiency filtration, but its built-in full heat exchanger can achieve the temperature adjustment effect of "warm in winter and cool in summer", thereby reducing air conditioning energy consumption.
 
The L series is a product series that Huandu focuses on in the field of household fresh air, which belongs to the cabinet fresh air fan, with an air volume of 300m³/h and 600m³/h optional, which is obviously born for the demand for large space fresh air, and all products are produced in the directly affiliated factory, and the quality control is naturally more guaranteed. In addition to the self-produced full heat exchanger, Huandu has upgraded its four-stage pure physical high-efficiency filtration system, which is more convenient to deal with severe haze, but the consumables need to be replaced regularly, and the continuous use cost of pure physical filtration is higher than that of Yuanda electrostatic dust collection HEPA high-efficiency filtration.
 
According to the different air supply modes, the L series is divided into two camps: direct air supply and pipe air supply. The so-called direct air supply, that is, the outdoor air is filtered and directly poured into the room from the top air outlet of the machine, relying on the natural diffusion of the air flow to push the fresh air to all corners of the room, while the dirty air is discharged through the return air outlet of the machine, or escaped from the outdoor through various gaps in the room, the models with 1A1 and 1B1 suffixes of the L series adopt this circulation scheme, such as L300-1A1, which represents the direct air supply cabinet type fresh fan with a fresh air volume of 300m³/h, 1B1 and 1A1 are not much different, Only the WiFi connection feature has been added.
 
Compared with the direct air supply model, the duct air supply cabinet of the L series has a significant improvement in ventilation effect. Pipeline air supply that is, the cabinet machine can be connected to PVC, PE and other pipes, so as to extend a plurality of return air outlets and arrange them in different rooms to achieve the central-level whole-house purification effect, although the installation process of the pipeline is relatively simple, but it will undoubtedly affect the visual effect of interior decoration, as for how to weigh the pros and cons of the two air supply modes, it needs to be determined according to the actual situation.
 
At present, Huandu has opened an official flagship store on the domestic e-commerce platform, the price of the B series wall-mounted model is about 5000 yuan, and the L series model is priced from 14000-20000 yuan according to the different air volume and functional configuration, this price has included the door-to-door installation cost, the offline service network of Huandu is also very perfect, and the specific selection and installation details still need to be communicated between consumers and merchants.