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RS ISO 7240-22: 2017
Fire detection and alarm systems — Part 22: Smoke-detection equipment for ducts

Abstract

This document specifies requirements, test methods and performance criteria for smoke-detection
equipment for ducts (SDED) for use in fire detection and alarm systems installed in buildings (see
ISO 7240-1).
The SDED samples the air from a duct and detects smoke in the sample.
NOTE 1 A common method of operation is to use differential pressure arising from airflow in the duct.
The SDED can use smoke detectors complying with ISO 7240-7 or other detectors complying with tests
specified in this document.
A common application for SDED is to detect visible smoke, for which detectors using scattered light or
transmitted light can be more suitable. However, requirements for detectors using ionization are also
included in this document for use in applications where detection of less visible fire aerosols is desired.
For the testing of other types of smoke detectors or smoke detectors working on different principles,
this document can be used for guidance. Smoke detectors with special characteristics, developed for
specific risks, are not covered.
NOTE 2 Certain types of detectors contain radioactive materials. The national requirements for radiation
protection differ from country to country and are not specified in this document.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 7240-22: 2017	ADOPTED ISO STANDARDS	Manufacturing engineering	55	Second Edition Mar 2024	Available