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ASHRAE 170-2025

Ventilation of Health Care Facilities (ANSI Approved; ASHE Co-sponsored)
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The purpose of ASHRAE 170-2025 is to define the minimum ventilation system design requirements for environmental control in healthcare facilities to ensure patient safety, comfort, and infection control. It is primarily used by designers, engineers, and facility managers as a mandatory set of standards for new buildings, additions, and major alterations. 

Primary Purposes

  • Infection Control & Safety: Establishes parameters for asepsis (sterility) and the management of chemical, physical, and biological contaminants to protect patients, staff, and visitors.
  • Environmental Control: Sets specific requirements for temperature, humidity, and odor control tailored to different healthcare zones.
  • Ventilation Standards: Mandates minimum outdoor air intake and total air change rates (ACH) for various space types.
  • Airflow & Pressurization: Defines requirements for positive and negative pressure to prevent cross-contamination between sterile and non-sterile areas. 

How It Is Used

  • Compliance & Code Enforcement: It is designed for adoption by code-enforcing agencies and is integrated into the Facility Guidelines Institute (FGI) guidelines, which form the basis for hospital design and construction.
  • System Design: Engineers use the standard's ventilation tables to calculate required airflow for specific rooms, such as operating theaters (often requiring 15–20 ACH) or patient isolation rooms.
  • Commissioning & Verification: Commissioning providers use it to verify that HVAC systems meet pressure and filtration standards before building occupancy and throughout the systems' life cycle.
  • Renovations: It provides the roadmap for determining which environmental criteria must be met when upgrading existing healthcare infrastructure. 

Key Updates in the 2025 Edition

  • Coordination with FGI 2026: Includes new space types to align with upcoming 2026 Facility Guidelines Institute standards.
  • Natural Ventilation: Introduces requirements for the optional use of natural ventilation in certain healthcare settings.
  • Construction Guidelines: Provides updated and reorganized requirements for ventilation management during construction activities.
  • Advanced Imaging: Updates requirements for Class 2 and Class 3 imaging rooms and nuclear medicine spaces.

 

SDO ASHRAE: American Society of Heating, Refrigerating, and Air Conditioning Engineers
Document Number Standard 170
Publication Date Dec. 1, 2025
Language en - English
Page Count 54
Revision Level
Supercedes
Committee
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