This part of JB/T 6723 specifies the classification, nomenclature, technical requirements, inspection rules and markings of condensing internal combustion engine cooling fans. This section applies to both cooling fans for condensing internal combustion engines with and without generators (hereinafter collectively referred to as fans).
GB/T 2521-1996 Cold-rolled grain-oriented and non-oriented magnetic steel strip(sheet)
GB/T 2828.1-2003 Sampling procedures for inspection by attributes--Part 1: Sampling schemes indexed by acceptance quality limit(AQL) for lot-by-lot inspection
GB/T 4942.1-2006 Degrees of protection provided by the integral design of rotating electrical machined (IP code) - Classification