Indoor Air Quality - A Guide to Understanding ASHRAE Standard 62-2001 Trane Handbook This guide reviews and explains the provisions of ASHRAE Standard 62-2001, “Ventilation for Acceptable Indoor Air Quality.” It also advocates system and equipment solutions that meet the explicit and suggested requirements of that standard. We hope the analysis provided here helps professionals responsible for designing, installing, maintaining, and operating of HVAC systems achieve compliance with Standard 62.