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ANSI ASHRAE STANDARD 170 , 2021


 Ventilation of

Health Care Facilities

ASHRAE 170 HEALTHCARE VENTILATION



The 2021 edition of ASHRAE/ASHE Standard 170 includes significant improvements to the
2017 edition. Most notably, the 2021 edition incorporates content in support of the new framework introduced in 2017, which divided the standard into three distinct sections: hospital
spaces, outpatient spaces, and nursing home spaces. The added content facilitates closer coordination between the standard and the Facility Guidelines Institute (FGI) documents, which, as
of 2018, comprise three separate books:
• Guidelines for Design and Construction of Hospitals

• Guidelines for Design and Construction of Outpatient Facilities
• Guidelines for Design and Construction of Residential Health, Care, and Support Facilities
As a continuous maintenance document, Standard 170 publishes addenda continually and
updates on a four-year cycle in alignment with the FGI documents.
Improvements to the 2021 edition include the following:
• Revised scope, with improved guidance on thermal comfort conditions provided
• Extensive modifications to address the Outpatient and Residential sections
• Addition of a new outpatient ventilation table to address nonacute-type spaces
• Extensive revisions to air filtration requirements
• Addition of new columns in the ventilation tables to prescribe filtration requirement and
designate unoccupied turn down
• Expanded guidance on separation distance requirements for varied intake and exhaust
arrangements, coordinating with related ASHRAE Standard 62.1 data
• Expanded requirements to allow airborne infectious isolation room exhaust discharge to
general exhaust under certain conditions
• Improved guidance on space ventilation requirements needed for anesthetic gas use
• Clarification of Class 1/Class 2/Class 3 imaging in coordination with FGI
• Revised definition of “invasive procedure”
• Improved guidance related to behavioral and mental health


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ANSI ASHRAE STANDARD 170 , 2021


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