ASHRAE Standard 170-2025 -- Ventilation of Health Care Facilities 

Full Description

Developed in partnership with Facility Guidelines Institute (FGI) and American Society of Health Care Engineering (ASHE), Standard 170 provides minimum requirements for ventilation of health care industry facilities and is intended for adoption by code-enforcing agencies.

New in the 2025 edition:

• Addition of requirements for the optional use of natural ventilation
• Total outdoor air calculation at the systems level for systems serving both Standards 170 and 62.1 spaces
• Updated requirements for Class 2 and 3 imaging rooms and associated nonimaging spaces and clarification regarding nuclear medicine
• Clarification of unoccupied turndown requirements in outpatient spaces
• Clarification of separation distances and stack discharge heights based on complex situations
• Additional function of space types for behavioral health
• Updated cooling and heating reserve capacity and fuel on-site requirements
• Reorganized and updated Section 10 for ventilation during construction
• Indication of equivalent acceptable alternative filtration testing requirements to allow for easier international use of the standard
• Updates to have similar requirements for similar space types across the different tables, when appropriate
• Clarification of bronchoscopy requirements
• Provision of new space types to coordinate with FGI 2026 space types
  
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  ASHRAE Standard 170-2025 -- Ventilation of Health Care Facilities 
  
  

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