To be precise, it should be an ultra-fine dry powder fire extinguishing device, which means that the fire extinguishing agent filled inside is ultra-fine dry powder. According to the national fire protection industry standards, the average particle size of ultra-fine dry powder is less than or equal to 20 microns. Fine dry powder is widely used in various fire protection fields due to its advantages such as convenient construction, relatively cheap cost, and good fire extinguishing effect. At present, the main domestic manufacturers of ultra-fine dry powder fire extinguishing devices include Guoanda Fire Technology (Xiamen) Co., Ltd., which can be found online Search, the company website: www.ssa119.com company HC website: / for reference.