Regarding the noise standards for food dehydrators during operation, the search results do not directly mention relevant industry standards or regulations. However, we can infer and understand the noise level of food dehydrators from some indirect information.
First, it can be seen from the search results that the design of food dehydrators usually focuses on low-noise operation. For example, the search results mentioned "low noise. The machine is relatively quiet when working, breaking the current large noise of industrial dehydrators on the market." This shows that the dehydrator was specially designed to reduce noise. Similarly, the search results also mentioned that the dehydrator uses some technical means to reduce noise during operation, such as "adopting flexible start, braking technology, long service life" and "smooth operation without vibration".
Secondly, although there is no clear noise standard, we can refer to the noise level of other similar equipment. For example, the noise level of the "belt-type concentrated dehydration machine" mentioned in the search results is 30dB, which is a relatively low noise level, indicating that the equipment is very quiet during operation.
In summary, although no clear noise standards for food dehydrators during operation were found, it can be seen from the search results that modern food dehydrators are usually designed to reduce noise to provide a quieter working environment. If you need more specific information, it is recommended to contact the device manufacturer or consult the device's technical manual.