ASHRAE Standards Addenda, Errata, and Interpretations
Addenda for ASHRAE Standards, including continuous maintenance standards, are available online in PDF format. Standards that are on continuous maintenance are continuously updated through addenda and ASHRAE makes these available free online.
Addenda
When it is determined that a published standard, guideline, code, or user's manual contains an error or errors, an errata sheet may be published at the discretion of the Manager of Standards.
Errata
A request for interpretation may be either 'official' or 'unofficial' (personal).
Interpretations
Preview ASHRAE Standards and Guidelines
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Current Popular ASHRAE Standards and Guidelines
Guideline 1.4-2019 -- Preparing Systems Manuals for Facilities
Guideline 11-2021 -Field Testing of HVAC Control Components
Guideline 12-2023, Managing the Risk of Legionellosis Associated with Building Water Systems
Guideline 28-2021 -- Air Quality within Commercial Aircraft
Guideline 29-2019 -- Guideline for the Risk Management of Public Health and Safety in Buildings
Guideline 36-2024 -- High-Performance Sequences of Operation for HVAC Systems
Guideline 44 - Protecting Building Occupants from Smoke During Wildfire and Prescribed Burn Events
Standard 15-2024, Safety Standard for Refrigeration Systems
Standard 15.2-2022, Safety Standard for Refrigeration Systems
Standard 34-2024, Designation and Safety Classification of Refrigerants
Standard 52.2-2017, Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size
Standard 55-2023, Thermal Environmental Conditions for Human Occupancy (ANSI Approved)
Standard 62.1-2022, Ventilation and Acceptable Indoor Air Quality
Standard 62.2-2022, Ventilation and Acceptable Indoor Air Quality in Residential Buildings
Standard 84-2024, Method of Testing Air-to-Air Heat/Energy Exchangers (ANSI Approved)
Standard 90.1-2022, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2022, Energy Standard for Buildings Except Low-Rise Residential Buildings (S-I)
Standard 90.2-2024, High-Performance Energy Design of Residential Buildings
Standard 90.4-2022 -- Energy Standard for Data Centers
Standard 100-2024, Energy and Emissions Building Performance Standard for Existing Buildings
Standard 111-2024, Testing, Adjusting, and Balancing of Building HVAC Systems
Standard 135-2024, BACnetTM A Data Communication Protocol for Building Automation and Control Networks
Standard 140-2023, Method of Test for Evaluating Building Performance Simulation Software
Standard 154-2022, Ventilation for Commercial Cooking Operations
Standard 161-2023 -- Air Quality within Commercial Aircraft
Standard 169-2021, Climatic Data for Building Design Standards
Standard 170-2021, Ventilation of Health Care Facilities
Standard 180-2018 -- Standard Practice for Inspection and Maintenance of Commercial Building HVAC Systems (ACCA Co-sponsored)
Standard 183-2024 -- Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings (ACCA Co-sponsored)
Standard 185.2-2020 -- Method of Testing Ultraviolet Lamps for Use in HVAC&R Units or Air Ducts to Inactivate Microorganisms on Irradiated Surfaces
Standard 188-2021, Legionellosis: Risk Management for Building Water Systems
Standard 189.1-2020, Standard for the Design of High-Performance Green Buildings
Standard 202-2024, Commissioning Process for Buildings and Systems
Standard 205-2023, Representation of Performance Data for HVAC&R and Other Facility Equipment
Standard 211-2018 (RA2023), Standard for Commercial Building Energy Audits
Standard 224-2023 -- Standard for the Application of Building Information Modeling (ANSI Approved)
Standard 241-2023, Control of Infectious Aerosols
Standards and Guidelines Referenced in Code
Guideline 11-2018 -Field Testing of HVAC Control Components
Guideline 12-2020 -- Managing the Risk of Legionellosis Associated with Building Water Systems
Guideline 28-2016 -- Air Quality within Commercial Aircraft
Guideline 36-2018 -- High-Performance Sequences of Operation for HVAC Systems
Guideline 36-2021 -- High-Performance Sequences of Operation for HVAC Systems
Standard 15-1994, Safety Code for Mechanical Refrigeration
Standard 15-2001, Safety Standard for Refrigeration Systems
Standard 15-2004, Safety Standard for Refrigeration Systems
Standard 15-2007, Safety Standard for Refrigeration Systems
Standard 15-2010, Safety Standard for Refrigeration Systems
Standard 15-2013, Safety Standard for Refrigeration Systems
Standard 15-2016, Safety Standard for Refrigeration Systems
Standard 15-2019, Safety Standard for Refrigeration Systems
Standard 15-2022, Safety Standard for Refrigeration Systems
Standard 16-1983 (RA 2009), Method of Testing for Rating Room Air Conditioners and Packaged Terminal Air Conditioners
Standard 23-2005, Methods of Testing for Rating Positive Displacement Refrigerant Compressors and Condensing Units
Standard 23.1-2010, Methods of Testing for Rating the Performance of Positive Displacement Refrigerant Compressors and Condensing Units That Operate at Subcritical Temperatures
Standard 29-1988 (RA 2005), Methods of Testing Automatic Ice Makers
Standard 32.1-2004, Methods of Testing for Rating Vending Machines for Bottled, Canned and Other Sealed Beverages
Standard 34-1978, Number Designation of Refrigerants (PDF is not searchable)
Standard 34-1989, Number Designation and Safety Classification of Refrigerants (PDF is not searchable)
Standard 34-1992, Number Designation and Safety Classification of Refrigerants
Standard 34-1997, Designation and Safety Classification of Refrigerants (PDF is not searchable)
Standard 34-2001, Designation and Safety Classification of Refrigerants
Standard 34-2004, Designation and Safety Classification of Refrigerants
Standard 34-2007, Designation and Safety Classification of Refrigerants
Standard 34-2010, Designation and Safety Classification of Refrigerants
Standard 34-2013, Designation and Safety Classification of Refrigerants
Standard 34-2016, Designation and Safety Classification of Refrigerants
Standard 34-2019, Designation and Safety Classification of Refrigerants
Standard 34-2022, Designation and Safety Classification of Refrigerants
Standard 37-1978, Methods of Testing for Rating Unitary Air Conditioning and Heat Pump Equipment (PDF is not searchable)
Standard 37-2005, Methods of Testing for Rating Electrically Driven Unitary Air-Conditioning and Heat Pump Equipment
Standard 41.1-1986 (RA 2001), Standard Method for Temperature Measurement
Standard 41.2-1987 (RA 1992), Standard Methods for Laboratory Airflow Measurement (PDF is not searchable)
Standard 41.6-1994 (RA 2001), Standard Method for Measurement for Moist Air Properties
Standard 41.9-2000, Calorimeter Test Methods for Mass Flow Measurements of Volatile Refrigerants
Standard 51-1999, Laboratory Methods of Testing Fans for Aerodynamic Performance Rating (PDF is not searchable)
Standard 52.1-1992, Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter
Standard 55-1992, Thermal Environmental Conditions for Human Occupancy
Standard 55-2013 -- Thermal Environmental Conditions for Human Occupancy (ANSI Approved)
Standard 55-2017, Thermal Environmental Conditions for Human Occupancy (ANSI Approved)
Standard 55-2020, Thermal Environmental Conditions for Human Occupancy (ANSI Approved)
Standard 62-1981, Ventilation for Acceptable Indoor Air Quality (PDF is not searchable)
Standard 62-1989, Ventilation for Acceptable Indoor Air Quality
Standard 62.1-2013, Ventilation for Acceptable Indoor Air Quality
Standard 62.1-2016, Ventilation for Acceptable Indoor Air Quality
Standard 62.1-2019, Ventilation for Acceptable Indoor Air Quality
Standard 62.2-2010, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings
Standard 62.2-2013, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings
Standard 62.2-2016, Ventilation and Acceptable Indoor Air Quality in Residential Buildings
Standard 62.2-2019, Ventilation and Acceptable Indoor Air Quality in Residential Buildings
Standard 84-2020, Method of Testing Air-to-Air Heat/Energy Exchangers (ANSI Approved)
Standard 90A,B,C, Energy Conservation in New Building Design (PDF is not searchable)
Standard 90-1975, Energy Conservation in New Building Design (Dual) (PDF is not searchable)
Standard 90.1-1989, Energy Efficient Design of New Buildings Except Low-Rise Residential Buildings (Dual)
Standard 90.1-1999, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-1999, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2001, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2001, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2004, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2004, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2007, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2016, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2016, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2019, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2019, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.1-2022, Energy Standard for Buildings Except Low-Rise Residential Buildings (I-P)
Standard 90.1-2022, Energy Standard for Buildings Except Low-Rise Residential Buildings (SI)
Standard 90.2-2007, Energy Efficient Design of Low-Rise Residential Buildings
Standard 90.2-2018, Energy Efficient Design of Low-Rise Residential Buildings
Standard 90.4-2016 -- Energy Standard for Data Centers
Standard 90.4-2019 -- Energy Standard for Data Centers
Standard 90.4-2022 -- Energy Standard for Data Centers
Standard 93-1977, Methods of Testing to Determine the Thermal Performance of Solar Collectors (PDF is not searchable)
Standard 100-2015, Energy Efficiency in Existing Buildings
Standard 100-2018, Energy Efficiency in Existing Buildings
Standard 103-1993, Method of Testing for Annual Fuel Utilization Efficiency of Residential Central Furnaces and Boilers (PDF is not searchable)
Standard 111-2008 (RA 2017)-- Testing, Adjusting, and Balancing of Building HVAC Systems
Standard 116-1995 (RA 2005), Methods of Testing for Rating Seasonal Efficiency of Unitary Air Conditioners and Heat Pumps
Standard 135-2020, BACnetTM A Data Communication Protocol for Building Automation and Control Networks
Standard 154-2016, Ventilation for Commercial Cooking Operations
Standard 161-2018 -- Air Quality within Commercial Aircraft
Standard 169-2021, Climatic Data for Building Design Standards
Standard 170-2017, Ventilation of Health Care Facilities
Standard 170-2013, Ventilation of Health Care Facilities
Standard 170-2008, Ventilation of Health Care Facilities
Standard 183-2007 (RA 2017) -- Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings (ACCA Co-sponsored)
Standard 183-2007 (RA 2020) -- Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings (ACCA Co-sponsored)
Standard 185.2-2014, Method of Testing Ultraviolet Lamps for Use in HVAC&R Units or Air Ducts to Inactivate Microorganisms on Irradiated Surfaces
Standard 188-2018, Legionellosis: Risk Management for Building Water Systems
Standard 189.1-2011, Standard for the Design of High-Performance Green Buildings
Standard 189.1-2014, Standard for the Design of High-Performance Green Buildings
Standard 189.1-2017, Standard for the Design of High-Performance Green Buildings
Standard 202-2018, Commissioning Process for Buildings and Systems
Standard 209-2018 -- Energy Simulation Aided Design for Buildings except Low-Rise Residential Buildings (ANSI Approved)
Standard 211-2018, Standard for Commercial Building Energy Audits