Health-care design evolves constantly, reflecting improvements and advancements in surgical techniques, equipment (such as MRIs and robotic surgical equipment), clinical practices, hospital design trends, energy efficiency, sustainable design, and other factors. ASHRAE/ASHE Standard 170, Ventilation of Health Care Facilities, was originally published in 2008 and was recently updated in January 2014. The standard was written by ASHRAE and the American Society for Healthcare Engineering (ASHE). This article recaps some of the more notable changes to the standard.