BS 6339:1983
Specification for dimensions of circular flanges for general purpose industrial fans
Specifies the dimensions of circular flanges for general purpose fans defined as fans for handling air which is non-toxic, non-saturated, non-corrosive, non-flammable, free from abrasive particles and not exceeding a temperature of 80°C or 40°C if the motor or the fan bearings are in the air stream.
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