UL 228
What is the laboratory for UL 228?
For UL 228, laboratory is Intertek Testing Services NA, Inc; standard title is Door Closers-Holders, With or Without Integral Smoke Detectors, verified against its source on 2026-09-17.
UL 228 | Door Closers-Holders, With or Without Integral Smoke Detectors |
— osha.gov, retrieved 2026-08-10
- Laboratory
- Intertek Testing Services NA, Inc.
- Standard number
- UL 228 verified
- Standard title
- Door Closers-Holders, With or Without Integral Smoke Detectors verified
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/its