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ASHRAE STD 62.1

Ventilation for Acceptable Indoor Air Quality

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Organization: ASHRAE
Publication Date: 26 June 2019
Status: inactive
Page Count: 6
scope:

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 note H assigned, and ventilation shutoff is not allowed. Lecture classroom has note H assigned, and ventilation shutoff is allowed. However, for college buildings, it is not clear which of these space types should be assigned to the classroom spaces. This addendum will clarify that college classrooms may use note H and have the ventilation shut off when they are unoccupied. This control type would also apply to other postsecondary classrooms, such as classrooms that are in a variety of building types, including classrooms in office buildings.

The rationale for combining lecture halls and postsecondary classrooms is that these are areas where room-generated emissions are small-they typically have hard surfaces and do not include painting supplies etc. Note that Table 6.2.2.1 has different space types specifically called out for other classroom spaces that might contain materials that off-gas regardless of level of occupancy. These include daycare, classrooms for younger students, art classrooms, science laboratories, wood/metal shop, etc.

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 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
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 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
A description is not available for this item.
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 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...
ASHRAE STD 62.1
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 23, 2019
VENTILATION FOR ACCEPTABLE INDOOR AIR QUALITY
A description is not available for this item.
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 When Addendum r to Standard 62.1-2016 was published, the footnote to old Table 5.16.1, “Airstreams or Sources,” did not transfer to new the Table 6.5.2. This addendum reinstates the note...
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