This part of IEC 60076-22 applies to electric fans mounted on liquid immersed power transformers according to IEC 60076-1 and reactors according to IEC 60076-6 with and without conservator for indoor or outdoor installation. It outlines the service conditions and the mechanical and electrical requirements that are common to all the equipment. The electric fans concerned by this standard are of the axially operating type and are for use on liquid to air coolers and for blowing out radiators. It also outlines the operation requirements specific to each equipment as well as the preferred dimensions relevant for interchangeability and uniform fan assembly and the type and routine test to be performed.