Reference Source

UL 555

For UL 555, laboratory is Southwest Research Institute; standard title is Fire Dampers, verified against its source on 2026-08-10.

Laboratory
Southwest Research Institute verified
Standard number
UL 555 verified
Standard title
Fire 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 555 | Fire 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.