Ehdotuksen tiedot

This International Standard specifies a large-scale fire test method for measuring the heat release rates (HRR) and the smoke-production rates (SPR) of wall systems. The fire scenario covered in this document is representative of severe fires originating in near wall or corner locations of an exterior or interior wall construction. Some examples of severe exterior fire scenarios include dumpster, balcony storage, and vehicle fires originating outside buildings. Fires caused by combustible storage inside un- or inadequately-sprinklered occupancies, such as warehouse and manufacturing occupancies represent a few examples of severe interior fires. All these scenarios can impart a heat flux in the order of 100 kW/m2 to the wall systems. This International Standard measures the HRR and SPR in compliance with ISO 24473 (Fire tests – open calorimetry – measurement of the rate of production of heat and combustion products for fires up to 40 MW). The standard also provides informative guidelines for heat release and smoke production performance limits, developed and used for risk evaluation by the insurance industry. The test method is not applicable for scenarios where a fire initiates within an air cavity, if present, of an exterior wall system. The test method does not incorporate a window structure and hence cannot cover the hazard from inadequately protected window openings in a post-flashover fire scenario.