Guideline 42-2023 -- Enhanced Indoor Air Quality in Commercial and Institutional Buildings

ASHRAE Guideline 42 supplements ANSI/ASHRAE Standard 62.1, Ventilation and Acceptable Indoor Air Quality, by providing a global audience of engineers, designers, hygienists, air quality practitioners, and building owners a roadmap of varied, evidence-based best practices for improving ventilation and acceptable IAQ, beyond minimum requirements. The guideline steps users through concepts, research, and processes that have proven useful when effectively designed, installed, and operated. Guideline 42 also aims to supplement related publications from ASHRAE and other organizations.

The sections of Guideline 42 are organized to reflect the path of air, beginning outside the building and moving through the building envelope, systems, and equipment to the indoor space.