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ASHRAE STD 62.1

Ventilation for Acceptable Indoor Air Quality

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Organization: ASHRAE
Publication Date: 22 June 2019
Status: inactive
Page Count: 6
scope:

FOREWORD

The current standard is silent on producing ozone within HVAC equipment. In some countries, ozone generators are accepted as air cleaners. In a recent poll of members of SSPC62.1, only 2% thought that having ozone producing components in a ventilation system is consistent with acceptable indoor air quality.

Ozone is harmful for health, and exposure to ozone creates risk for a variety of symptoms and diseases associated with the respiratory tract. Many products of ozone homogeneous and heterogeneous reaction processes also create risks for health, including formaldehyde, unsaturated aldehydes (produced during the reaction of ozone with ketones and alcohols), and ultrafine particles (secondary organic aerosols).

Ozone emission is thus undesirable. However, there is no consensus on the safe level of ozone. For example, ASHRAE's Environmental Health Committee issued an emerging issue brief suggesting "safe ozone levels would be lower than 10 ppb" and that "the introduction of ozone to indoor spaces should be reduced to as low as reasonably achievable (ALARA) levels." Still, even widely used guidelines are not entirely consistent with all available epidemiological literature on the effects of ozone, and there is relatively little known about the long-term effects of exposure to low concentrations of ozone.

The current state of the science regarding the health effects of ozone strongly suggests that the use of air cleaners that emit ozone by design should not be permitted; the same information and advice is given by the USEPA, among others. There is more uncertainty about recommendations for air cleaners that do not use ozone by design for air cleaning but produce ozone unintentionally, as a by-product of their operation. There are devices that emit ozone but at the same time reduce concentrations of other harmful contaminants. The state of the science does not allow making highly certain trade-offs between increased exposure to ozone and the ozone reaction byproducts and reduced exposure to other contaminants.

Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.

Document History

June 30, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD The language of Section 5.10, “Maximum Indoor Air Dew Point in Mechanically Cooled Buildings,” has been interpreted by users to mean that the standard requires humidity sensors in every...
June 24, 2021
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
June 15, 2021
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
January 27, 2021
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum a clarifies that air density adjustments are permitted but are not required. At the publication of ANSI/ASHRAE Standard 62.1-2016, General Notes for Table 6.2.2.1, Note 3 was...
January 19, 2021
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
December 1, 2020
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
November 19, 2020
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
November 19, 2020
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
October 30, 2020
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum d clarifies that open-circuit cooling towers, closed-circuit cooling towers, and evaporative condensers are all covered by the minimum separation distance requirements. Note: In...
October 30, 2020
Ventilation for Acceptable Indoor Air Quality
FOREWORD Unresolved objectors to Standard 62.1-2016 Addendum s noted that the definition for “unusual source” is unclear in distinguishing whether “rarely” refers to a source that is intermittent or...
April 17, 2020
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
February 1, 2020
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
October 16, 2019
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
October 16, 2019
Ventilation and Acceptable Indoor Air Quality
A description is not available for this item.
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD The Natural Ventilation Procedure was recently modified to require mechanical ventilation with certain exceptions. Addendum l provides specific requirements for the exceptions by providing...
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD The 60°F (15°C) indoor-air dew-point limit avoids the microbial growth problems frequently observed when humid outdoor air infiltrates into buildings that are mechanically cooled. Microbial...
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
A description is not available for this item.
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD Table 6.2.2.1, “Minimum Ventilation Rates in Breathing Zone,” includes educational space types, including “Classroom (age 9 plus)” and “Lecture classroom.” The first of these does not have...
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD The 2018 Facility Guidelines Institute (FGI) Guidelines for Design and Construction of Outpatient Facilities require certain outpatient spaces to meet local ventilation codes and not...
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD Table 6.5, “Minimum Exhaust Rates,” lists minimum exhaust rates for certain spaces in which contaminant generation has been deemed high enough that the contaminant cannot be diluted and...
June 26, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD This addendum adds a reference to ASHRAE/ASHE Standard 170 and an exception to direct users to use the ventilation rates in ASHRAE/ASHE Standard 170 for asepsis and odor control for health...
June 23, 2019
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
ASHRAE STD 62.1
June 22, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD The current standard is silent on producing ozone within HVAC equipment. In some countries, ozone generators are accepted as air cleaners. In a recent poll of members of SSPC62.1, only 2%...
June 22, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum ar modifies language in Informative Appendix E, “Acceptable Mass Balance Equations for Use with the IAQ Procedure,” to be consistent with the current IAQP. It also clarifies that...
June 22, 2019
Ventilation for Acceptable Indoor Air Quality
FOREWORD Addendum ap updates publication dates and URIs in Section 9, “References,” and Informative Appendix J, “Informative References.” Note: In this addendum, changes to the current standard are...
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