ASHRAE guidelines and standards open for comment

The below drafts are open for 45-day public reviews

• BSR/ASHRAE Standard 241P, Control of Infectious Aerosols (first publication public review). Commenting is open April 25 to June 9.

  This standard is ASHRAE’s first in more than a century to set requirements for control of airborne disease transmission in non-health care facilities. It addresses requirements for minimum clean airflow, air distribution, use of filters and air cleaners, and the assessment, planning, and implementation process for all types of occupiable space, including residential and health care spaces. It is complementary to standards that specify requirements for acceptable indoor air quality. It is intended to be used to enable systems to exceed the requirements of these standards when necessary. One of the main advances of Standard 241 is that it sets requirements for Equivalent Clean Airflow per person for Infection Control (ECAi), permitting air that is filtered or treated by air cleaners to be used on an equal footing with outdoor air. In support of this approach, it sets extensive requirements for effectiveness and safety testing of filtration and air cleaning systems.

• BSR/ASHRAE/IES Addendum bk to ANSI/ASHRAE/IES Standard 90.1-2022, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (second public review draft). Commenting is open May 16 to June 30. 

  This updated version of Addendum bk establishes requirements for utilizing an electric or fuel-fired heat pump as the initial heat source where air-cooled or air-source HVAC systems serve building areas that are both heated and cooled. Life cycle cost analyses show that systems using air-source heat pumps combined with natural gas furnaces can offer lower upfront and annual costs for most climate zones, but climate zones 1A and 2A will see an increase in greenhouse gas emissions due to the lower cooling efficiency of heat pumps (as compared to air conditioners).

• BSR/ASHRAE/IES Addendum cy to ANSI/ASHRAE/IES Standard 90.1-2022, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (first public review draft). Commenting is open May 16 to June 30.

  This update improves humidity control by using dew point temperature instead of relative humidity and making set points flexible instead of strict. It also ensures humidity sensors are more accurate and adjusts cooling system rules to work better. There’s an exception for multi-zone HVAC systems, and new limits on dehumidification when spaces are unoccupied  (this could have negative impacts for spaces in hospitals where sterile supplies need to be protected). These changes don’t add major costs but do require humidity sensors in all HVAC zones to help manage air quality efficiently. Systems with digital controls can allow temporary humidity increases as long as the average stays within safe limits. Overall, the goal is to save energy while keeping humidity levels under control.

• ASHRAE/ASHE Addendum m to ANSI/ASHRAE/ASHE Standard 170-2021, Ventilation of Health Care Facilities (third independent substantive change public review draft. Commenting is open May 23 to July 7. 

  Proposed Addendum m revises Tables 7-1, 8-1, 8-2 and 9-1 to incorporate types of room units that are allowable for each space type. This will provide clarity and consistency within this standard. This addendum comprises the following general edits: New definition for room unit; and revisions to Tables 7-1, 8-1, 8-2 and 9-1 modifying the general requirement for recirculating room units to align with the definition and specify the type of room unit allowable in eachs pace. Revisions to the requirements for air change rate provisions with respect to room units.

The below drafts are open for 30-day public reviews 

• BSR/ASHRAE/IES Addendum ct to ANSI/ASHRAE/IES Standard 90.1-2022, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (first public review draft). Commenting is open May 16 to June 15. 

  The purpose of Addendum ct is to update the mechanical systems in Section 12 to coordinate with the new prescriptive HVAC requirements proposed in 90.1-2022 Addendum bk.

• BSR/ASHRAE/IES Addendum db to ANSI/ASHRAE/IES Standard 90.1-2022, Energy Standard for Sites and Buildings Except Low-Rise Residential Buildings (first public review draft). Commenting is open May 16 to June 15.

  This addendum creates a new defined term for compressed air primary storage and inserts the definition in Section 10.4.6.1 where appropriate.

Visit the ASHRAE portal to make comments on the above addenda.