Defines a laboratory substitution method for determination of insertion loss without flow of ducted, mostly absorbent, circular and rectangular silencers in addition to other duct elements to be used in ventilation and air-conditioning systems.

NBN EN ISO 11691:2009

NEN EN ISO 11691:2009 - Identical

UNI EN ISO 11691:2009 - Identical

SS EN ISO 11691 Ed. 1 (1995) - Identical

ISO 11691:1995 - Identical

UNE EN ISO 11691:1996 - Identical

NS EN ISO 11691 Ed. 1 (1995) - Identical

UNI EN ISO 11691:1997 - Identical

NF EN ISO 11691:1996 - Identical

I.S. EN ISO 11691:1996 - Identical

DIN EN ISO 11691 (1996-02) - Identical

ONORM EN ISO 11691:1996 - Identical

BS EN ISO 11691:1997 - Identical

NEN EN ISO 11691:1995 - Identical

SN EN ISO 11691:1996 - Identical