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Drejtoria e Përgjithshme e Standardizimit

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ISO/WD TS 25399

Large Outdoor Fires and the Built Environment: harmonizing the test methods for thermal flux exposure

General information

Current stage: 20.60 Effective date: Apr 10, 2026

Originator: ISO

Owner: ISO/TC 92

Type: Technical Specification

Scope

This TS first presents a review of the different worldwide existing tests to assess the resistance of building components (mainly vents and roofs) under the thermal flux exposure during a large outdoor fire. Then a methodology is proposed to harmonize these tests into a single international ISO standard.

Life cycle

NOW

IN_DEVELOPMENT
ISO/WD TS 25399
20.60 Close of comment period
Apr 10, 2026