scope:

Defines an additional test method which may be used when assessing the watertightness of curtain walling, both its fixed and openable parts. It is a supplementary test, not required for classification purposes, and it should be used only when the project specifier has determined its necessity. It describes how the outside face of a curtain, walling specimen should be subjected to a continuous spray of water and a turbulent airflow, with continuous pulses of positive air pressure generated from within the chamber.