UL 555S
For UL 555S, standard title is Smoke Dampers; nrtl is ITS; laboratory is Intertek Testing Services NA, Inc; status is currently recognized, recorded from its source on 2026-08-10.
- Test standard
- UL 555S verified
- Standard title
- Smoke Dampers verified
- NRTL
- ITS verified
- Laboratory
- Intertek Testing Services NA, Inc. verified
- Status
- currently recognized our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
UL 555S | Smoke Dampers |
— osha.gov, retrieved 2026-08-10
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/its