In the hot and rainy season, traditional Chinese medicine is easy to be affected by moisture, mildew and moth, which makes it difficult to store. Sulfur fumigation is used as the traditional storage method. However, sulfur fumigation will not only produce toxic and side effects, but also reduce the effective components of medicinal materials. With the development of science and technology, industrial HVLS fans can be replaced of sulfur fumigation to physically dehumidify and prevent mildew, achieving safe storage of traditional Chinese medicine.

The quality of Chinese medicinal materials changes constantly during storage. The result of the change is the decline of drug properties and quality, or the inability to be used as medicine. The main factor affecting the deterioration is the temperature and humidity of the environment. Inappropriate temperature and humidity will cause changes of traditional Chinese medicine, such as drying, mildew, insect pests, bonding, oil separation and so on. Affected by natural conditions, in northern China, it is mainly characterized by mildew and insect pests in summer and dry in winter; In the south, it is characterized by mildew and insect pests. In fact, there are three main factors endangering the storage quality (hereinafter referred to as "three detriments"), namely warehouse insects, microorganisms and inappropriate moisture content of medicine. All three are related to air temperature and humidity. If these three problems can be solved, the quality of medicinal materials can be guaranteed and safe maintenance can be realized.

Generally, the water content of traditional Chinese medicine is 10% - 20%. However, in summer, the humidity in many places will reach 80% or higher. Under such environmental conditions, traditional Chinese medicine will absorb a large amount of water and increase the water content (damp). It’s easy to become moldy due to microorganisms such as molds. Chinese medicinal materials containing sugar, mucus and starch are more likely to absorb moisture and deteriorate.

In order to prevent the above problems, the traditional method is to preserve Chinese medicinal materials after sulfur fumigation. However, sulfur fumigation will not only produce toxic and side effects, but also reduce the effective components of medicinal materials. In recent years, China's herbal medicine industry has paid great attention to herbal medicine maintenance, especially for valuable herbal medicines. Many attempts have been made, such as controlled atmosphere storage and vacuum maintenance, but deterioration of traditional Chinese medicine has not been completely solved.

There are two key indicators of environmental control: temperature and humidity. The Pharmacopoeia has different requirements for the preservation environment of different medicinal materials. Although the Pharmacopoeia does not specify drought index, the relative humidity of drying environment should generally be less than 50%. With the development of science and technology, the warehouse with  temperature and humidity regulation has been established to store medicinal materials which uses automatic control technology to regulate temperature and humidity. As the investment cost is huge, and not all warehouses are rebuilt, good natural ventilation can not be achieved for medicinal materials. Therefore, in recent years, HVLS large industrial fan has been gradually applied to medicinal material storage warehouse.

Vanse HVLS fan is specially designed for large spaces. Characterized by low speed and high air volume, it perfectly solves ventilation, cooling, dehumidification and mildew prevention. The air flow formed by the blades is pushed to the ground in a cone shape from top to bottom, and flows horizontally along the ground. When encountering the horizontal air flow blocked by the side or adjacent to the fan, it is pushed upward to the roof, so as to strengthen the air circulation in an all-round, no dead angle and eliminate the temperature stratification. The circulating air can be quickly exchanged with fresh air through doors and windows or roof fans, which reduces the retention of turbid gas and moisture, effectively dehumidifies and prevents mildew, maintains the fresh air circulation of medicinal materials in the warehouse and increases the storage life. Vanse's super large ceiling fan provides a perfect solution to humidity in the storage of medicinal materials, which has been fully affirmed by the medicinal manufacturers.