Industrial fans -- Determination of fan sound power levels under tandardized laboratory conditions -- Part 4: Sound intensity method -- Technical Corrigendum 1— 2 стр.
Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods -- Technical Corrigendum 1— 4 стр.
Industrial fans -- Determination of fan sound power levels under standardized laboratory conditions -- Part 3: Enveloping surface methods -- Amendment 1— 6 стр.