# ISO 7235:1991 — Withdrawn and superseded ISO standards

For ISO 7235:1991, item title is Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and total pressure loss; status code is 9599; successor is ISO 7235:2003; withdrawn / published date is 1991-04-11, recorded from its source on 2026-08-05.

- **Identifier:** ISO 7235:1991 _(verified: appears in the quote below)_
- **Item title:** Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and total pressure loss _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 7235:2003
- **Withdrawn / published date:** 1991-04-11 _(verified: appears in the quote below)_

## What the source says

> 13876,IS,,ISO 7235:1991,"Acoustics — Measurement procedures for ducted silencers — Insertion loss, flow noise and total pressure loss","Acoustique — Méthodes de mesurage pour silencieux en conduit — Perte d'insertion, bruit d'écoulement et perte de pression totale",1991-04-11,1,['91.120.20'],ISO/TC 43/SC 1,9599,,[30385],"['en','fr']",27,<p>Specifies the substitution method for determining the insertion loss. The measurement procedures are intended for laboratory measurements on silencers but may also be used for in situ measurements on silencers if the requirements of ISO 7235 can be met. Applies to silencers for ventilating and air-conditioning systems. Does not apply to reactive silencers

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).