DS DS/EN 50216-12
DS DSEN 50216-12 2011-MAY-13 Power transformer and reactor fttngs - Part 12 Fans
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EN 50216-12 deals with fans for oil-to-air coolers used for transformers as well as fans used for blowing out radiators. Only fans operating axially are dealt with in this standard specification. This standard specification defines the dimensions and requirements for ensuring fan interchangeability and uniform fan assembly.