As equipment technologies advance, OR ceilings are getting more and more crowded. Our Applications Engineers strive to recommend OR ceiling layouts and diffuser selections compliant with ASHRAE Standard 170, Ventilation for Health Care Facilities, the Facilities Guideline Institute (FGI) 2010 Guidelines for Design and Construction of Healthcare Facilities, the ASHRAE HVAC Design Manual for Hospitals and Clinics, and the 2011 ASHRAE HVAC Applications Handbook. Special consideration is given to local code requirements that may exceed those published by ASHRAE and FGI.