Ashrae Guideline 12 2025 Changes. Ashrae notes that guideline 12 can be useful in the implementation of ansi/ashrae standard 188, which establishes minimum legionellosis risk management. Ashrae’s water system risk management suite of standards and guidelines provides minimum requirements and informative guidance for the design of building water systems that reduces the risk of microbial growth and provides measures for microbial control and the associated hazards.

They reduce engineering, programming, and commissioning. “a2l refrigerants can be a single.