R-290

For R-290, ashrae safety class is A3, verified against its source on 2026-08-11.

Refrigerant: R-290 verified
ASHRAE safety class: A3 verified

Verified2026-08-11

Review by2027-08-11

DatasetHVAC refrigerant replacements: retrofit compatibility, safety class, GWP and lubricant

What the source says

Using these safety groups, HFO-1234ze(E), HFC-32 and the refrigerant blends R-452B, R-454A, R-454B, R-454C, R-457A, and R-516A are in the A2L Safety Group, while R-290, R-441A, and the components of HCR 4141 are in the A3 Safety Group.

— federalregister.gov, retrieved 2026-08-11

Source

federalregister.govhttps://www.federalregister.gov/documents/2025/11/10/2025-19812/protection-of-stratospheric-ozone-listing-of-substitutes-under-the-significant-new-alternatives

Last verified against source: 2026-08-11. Due for re-check by 2027-08-11. This page as Markdown · OKF bundle · full dataset as JSON.