ASHRAE is looking for a third round of public comments on ASHRAE Guideline 12-2000R, Proposed Revision of Guideline 12-2000, Managing the Risk of Legionellosis Associated with Building Water Systems.

This public comment is open until Dec. 17 and those interested in reviewing and commenting on the guideline can do so through the ASHRAE Online Comment Database. In this Independent Substantive Change public review draft, only revisions in strikethrough and underlined are open for comment.

ASHRAE Guideline 12 purpose is to provide information and guidance to assist in control of legionellosis associated with building water systems. It also provides guidance useful in the implementation of ASHRAE Standard 188: Legionellosis: Risk Management for Building Water Systems.

ASHRAE Guideline 12 is intended for use by owners of human-occupied buildings and those involved in the design, construction, installation, commissioning, management, operation, maintenance, and service of centralized building water systems and components.

“This guideline addresses an important issue that impacts public health and safety, so feedback is critical,” said Paul Lindahl, committee chair for ASHRAE Standing Standard Project Committee (SSPC) 188, the committee responsible for writing Guideline 12. “Guideline 12 will be a strong companion to ASHRAE Standard 188 in an effort to provide building owners with the resources needed to reduce the risk of Legionellosis and save lives.”

For more information and to comment, visit