UL 555S

For UL 555S, laboratory is UL LLC; standard title is Leakage Rated Dampers for Use in Smoke Control Systems, verified against its source on 2026-08-10.

Laboratory: UL LLC verified
Standard number: UL 555S verified
Standard title: Leakage Rated Dampers for Use in Smoke Control Systems verified

Sourceosha.gov

Verified2026-08-10

Review by2026-12-08

DatasetWhich OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

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/ul

Last verified against source: 2026-08-10. Due for re-check by 2026-12-08. This page as Markdown · OKF bundle · full dataset as JSON.