UL 441

For UL 441, laboratory is Intertek Testing Services NA, Inc; standard title is Gas Vents, verified against its source on 2026-08-10.

Verified2026-08-10

Review by2026-12-08

What the source says

UL 441 | Gas Vents |

— osha.gov, retrieved 2026-08-10

osha.govhttps://www.osha.gov/nationally-recognized-testing-laboratory-program/its

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.