1 Scope

1.1 This Standard contains requirements for water mist nozzles for use with water mist fire-protection systems intended for the protection of residential, light and ordinary hazard areas as well as shipboard machinery, control spaces, service areas, and public spaces. The intended application and use of a water mist nozzle is referenced in the Manufacturer's Design and Installation Instructions. See Section 57, Design and Installation Instructions.

1.2 This Standard is intended to address minimum fire-protection performance, construction, and marking requirements for water mist nozzles.

Summary of Topics

This new Third Edition of ANSI/UL 2167 dated May 11, 2026 includes the following changes in requirements:

– Editorial and formatting revisions; 4.2, 17.4, Table 45.1, 48.3.4, 49.2.2, Table 49.1, Table 49.2, and 51.2.3.

– Alignment and clarifications to existing requirements; 5.2, 5.14, 5.22, 9.4, Section 13, Section 14, 15.3, 18.1 – 18.3, 30.1.4, 35.1, 35.2, and 37.1.

– Expansion of requirements of Shipboard Machinery Space Fire Tests, Section 47; 5.13.

– Addition of tests for open nozzle caps; 6.1, Section 19, Section 20, Section 21, 30.1.1, 30.1.2, 30.1.8, 30.2.1, 30.2.8, 30.3.1, 30.3.2, 30.4.1, 30.4.2, 30.5.1, 30.5.2, 30.5.3, 30.5.5, 30.6.1, 30.7.1, and 39.1.