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99.60 Withdrawal effective Apr 1, 2003
CEN
CEN/TC 211 Acoustics
European Norm
17.140.20 Noise emitted by machines and equipment | 23.120 Ventilators. Fans. Air-conditioners
Withdrawn
This International Standard specifies a method for testing ducted fans to determine the sound power radiated into an anechoically-terminated duct on the inlet and/or outlet side of the equipment. It applies to fans which emit steady, broad-band, narrow-band and discrete-frequency sound. It applies to air temperatures between - 50 øC and + 70 øC. The test duct diameter range is from 0,15 to 2 m. The maximum flow velocity is 30 m/s and the maximum swirl angle is 15ø. An example of a method for determining the angle of swirl is given in Annex F. The one-third octave band centre frequency range is from 50 Hz to 10 000 Hz. Note: The flow noise suppression of the sampling tube (see 6.2.1) may be insufficient at higher velocities and at higher angles of swirl.
Legislation related to this standard
Machinery - Safety of machinery: general essential health and safety requirements
Harmonized/Supporting
WITHDRAWN
EN 25136:1993
99.60
Withdrawal effective
Apr 1, 2003
WITHDRAWN
EN ISO 5136:2003