UL 555S
For UL 555S, standard title is Leakage Rated Dampers for Use in Smoke Control Systems; status is listed as appropriate, recorded from its source on 2026-08-10.
- Test standard
- UL 555S verified
- Standard title
- Leakage Rated Dampers for Use in Smoke Control Systems verified
- Status
- listed as appropriate 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 2026-08-10
Source
- osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/list-standards