Reference Source

UL 555S

For UL 555S, laboratory is Intertek Testing Services NA, Inc; standard title is Smoke Dampers, verified against its source on 2026-08-10.

Laboratory
Intertek Testing Services NA, Inc. verified
Standard number
UL 555S verified
Standard title
Smoke Dampers verified
Sourceosha.gov
Verified
Review by
DatasetWhich OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

What the source says

UL 555S | Smoke Dampers |

— osha.gov, retrieved 2026-08-10

Source

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