The following is an explanation of several diffuser types of fire fan boxes. Customers who use different types of fire fan boxes may know that their use is inseparable from the use of relevant diffusers. In this process, in order to further help customers understand the 3C fire damper, the technical staff of the 70℃ fire damper will describe several diffuser types of fire fan boxes as follows:  
1. The outer cylinder of the diffuser of the fire fan box is of equal diameter, and the casing is a reducing cone cylinder, so the flow area of the fluid can be increased. This type of diffuser is easy to process and is suitable for occasions where the diameter of the ventilation duct is the same as that of the fan.  
2. The diffuser of the fire fan casing uses an equal-diameter inner core and outer cylinder diffuser. Its diffusion effect is not as good as that of the previous type, but due to its simple structure, it is also suitable for occasions where the diameter of the exhaust valve is larger than that of the high-temperature fire smoke exhaust fan.