NF E51-006-1/A1*NF ISO 13347-1/A1:2011 Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1 : general overview - Amendment 1.
2011NF E51-006-1/A1*NF ISO 13347-1/A1:2011 Industrial fans - Determination of fan sound power levels under standardized laboratory conditions - Part 1 : general overview - Amendment 1.