What do these English terms in the fan data sheet mean?
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As shown in the figure, what do the letters after centrifugal type and electrical rating mean? What does \"Centrifugation type\" mean below?
The first red box indicates the type of fan impeller, specifically the shape of the blades. AF stands for airfoil-shaped impeller, while BC refers to backward curvature; these are just abbreviations in English. You can simply ask the equipment manufacturer for more details
The electrical ratings later on are somewhat similar to the explosion-proof electrical requirements: CL denotes the level, GR indicates the group, and Div represents the zone