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UL 1738 Ed. 5-2026 (2026)

Venting Systems for Gas-Burning Appliances, Categories II, III, and IV - Published Date: April 7, 2026

This new Fifth Edition of ANSI/UL 1738 dated April 7, 2026, includes the following changes in requirements: – Resistance to Condensate-Exposure Corrosion Test for Metals – Alternate method; 39.4 – This new edition also incorporates editorial changes including renumbering and reformatting to align with the current style.

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