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The American Society of Plumbing Engineers (ASPE) is pleased to announce that ASPE/ANSI 45-2025: Siphonic Roof Drainage was approved as an American National Standard by the American National Standards Institute (ANSI) on May 5, 2025.
The 45-day ANSI public review period will be from June 6, 2025, to July 21, 2025. Proposed Addendum C will supplement ANSI/ACCA 3 Manual S – 2023, and Addenda A and B – 2024.
The technical and visual guide is designed to educate plumbing professionals on one of the brand’s most powerful and often under-appreciated advantages: interchangeability.