Recommended series/models: CA series, CAC series, CAQ350
 
Founded in Switzerland in 1895, Sender Group develops and produces heating radiators, heat pump systems, central vacuum cleaners and, of course, fresh air systems. In 1995, Sender (China) HVAC Equipment Co., Ltd., a joint venture established by the Swiss Sender Group and Beijing Large State-owned Key Enterprise "Beijing Building Materials Group", was officially born, and has built a factory covering an area of 200,000 square meters, with a full set of advanced production equipment from Germany, and the fresh air system is also produced in domestic factories.
 
As the leader of the domestic HVAC industry, Sender's fresh air system also performs well, the main series on sale are CA, CAC, and the original imported CAQ, the three series provide multi-specification fresh air volume options, which is convenient for consumers to purchase according to their own house type, the whole system is equipped with German EBM top motor as standard, running strong and quiet, even if the model with the highest air volume, the maximum noise is only 45dB (A), which will not affect sleep.
 
Sender is also a domestic steel radiator manufacturer, has a deep understanding of thermodynamics, Sender for its full heat exchange module using polymer Kanshu membrane as a material, heat exchange at the same time can also allow water vapor to pass through, to achieve the effect of temperature and humidity control, CA and CAC series due to the use of traditional diamond-shaped design, the airflow contact area is low, Sender 300m³/h model maximum enthalpy exchange rate is about 67%, inferior to Panasonic, Braun and other competing products of the same specification, However, the imported CAQ adopts an advanced diamond trimming shape, and the airflow contact surface has been further improved compared to the mainstream hexagonal design, but Sender did not disclose its energy efficiency.
 
Although the CA and CAC series are slightly deficient in the appearance design, the material of Kanshu film still has many bright spots, and its surface is coated with a layer of special material Micro-ban, which can not only inhibit the growth of bacteria, but also can be directly rinsed with water, overcoming the defects of traditional paper cores that are prone to mold, cannot be rinsed and have a short life, which is considered a reversal.
 
In terms of filtration performance, Sender's fresh air system filtration configuration is decent, with a primary HEPA filter screen to form a filter layer, which is suitable for coping with low and medium haze pollution, in addition, the CAC series has an internal circulation mode, if the outdoor air pollution is too serious, it can only circulate the indoor air to prevent the filter element from being lost too quickly, but the CA series is not equipped with this function, which is also the biggest difference between CAC and CA series. As for the CAQ, due to the relatively abundant internal space, there are two built-in HEPA filters, and the haze removal performance has been slightly upgraded.
 
Although Sender has opened a flagship store on the e-commerce platform, the coverage of offline services still needs to catch up. In terms of price, the pricing of CA and CAC series is relatively close to the people, between 12,000 and 18,000 yuan, while the price of the original imported CAQ350 is as high as 58,800 yuan, which is obviously prepared for consumers who have consumption upgrade needs.