UL 555S · UL
For UL 555S, nrtl is UL; standard title is Leakage Rated Dampers for Use in Smoke Control Systems; laboratory is UL LLC; osha docket is OSHA-2009-0025; status is currently recognized, recorded from its source on 2026-10-01; source re-checked 2026-11-10.
- Test standard
- UL 555S verified
- Standard title
- Leakage Rated Dampers for Use in Smoke Control Systems verified
- NRTL
- UL verified
- Laboratory
- UL LLC
- OSHA docket
- OSHA-2009-0025 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 | Leakage Rated Dampers for Use in Smoke Control Systems |
— osha.gov, retrieved 2026-10-01
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
OSHA docket
Docket Number: OSHA-2009-0025
— all from osha.gov, retrieved 2026-10-01
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/ul