What is ISO 21925 ‑ 1 about?
ISO 21925 ‑ 1 is part one of a multi-series of international standards on fire resistance tests which covers fire dampers for air distribution systems.
ISO 21925 ‑ 1 specifies a test method for the determination of the resistance of fire dampers to heat, and for the evaluation of their ability to prevent fire and smoke spreading from one fire compartment to another through an air distribution system.
Note: ISO 21925 ‑