# UL 155 — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For UL 155, laboratory is Southwest Research Institute; standard title is Tests for Fire Resistance of Vault and File Room Doors, verified against its source on 2026-08-10.

- **Laboratory:** Southwest Research Institute _(verified: appears in the quote below)_
- **Standard number:** UL 155 _(verified: appears in the quote below)_
- **Standard title:** Tests for Fire Resistance of Vault and File Room Doors _(verified: appears in the quote below)_

## What the source says

> UL 155 | Tests for Fire Resistance of Vault and File Room Doors |

## Source

- https://www.osha.gov/nationally-recognized-testing-laboratory-program/swri

Last verified: 2026-08-10. Review by: 2026-12-08.
Part of [Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced](https://referencesource.org/nrtl-recognition-scopes/).