UL 641

For UL 641, laboratory is UL LLC; standard title is Type L Low-Temperature Venting Systems, verified against its source on 2026-08-10.

What the source says

UL 641 | Type L Low-Temperature Venting Systems |

— osha.gov, retrieved 2026-08-10

Source

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

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.