# ISO 11691:1995 — Withdrawn and superseded ISO standards

For ISO 11691:1995, item title is Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory survey method; status code is 9599; successor is ISO 11691:2020; withdrawn / published date is 1995-08-03, recorded from its source on 2026-08-05.

- **Identifier:** ISO 11691:1995 _(verified: appears in the quote below)_
- **Item title:** Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory survey method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 11691:2020
- **Withdrawn / published date:** 1995-08-03 _(verified: appears in the quote below)_

## What the source says

> 19620,IS,,ISO 11691:1995,Acoustics — Measurement of insertion loss of ducted silencers without flow — Laboratory survey method,Acoustique — Détermination de la perte d'insertion de silencieux en conduit sans écoulement — Méthode de mesurage en laboratoire,1995-08-03,1,['91.120.20'],ISO/TC 43/SC 1,9599,,[69859],"['en','fr']",6,"<p>Specifies a laboratory substitution method to determine the insertion loss of ducted circular and rectangular silencers without flow, as well as other duct elements for use in ventilating and air-conditioning systems.</p>"

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).