# UL 10C — Which OSHA NRTL is recognized for which test standard: all 21 labs' scopes of recognition, cross-referenced

For UL 10C, laboratory is QAI Laboratories, LTD (QAI); standard title is Positive Pressure Fire Tests of Door Assemblies, verified against its source on 2026-08-10.

- **Laboratory:** QAI Laboratories, LTD (QAI) _(verified: appears in the quote below)_
- **Standard number:** UL 10C _(verified: appears in the quote below)_
- **Standard title:** Positive Pressure Fire Tests of Door Assemblies _(verified: appears in the quote below)_

## What the source says

> UL 10C | Positive Pressure Fire Tests of Door Assemblies |

## Source

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

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/).