Friday, December 14, 2018

ASHRAE STANDARD: Ventilation For Acceptable Indoor Air Quality

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This release of ASHRAE Standard 62 incorporates the seven addenda approved since the publication of ASHRAE Standard 62-1999 (see Reference i), making a total of eleven addenda approved since the standard was converted to continuous maintenance in 1997. More specific information on the
content of each addendum is included in an informative appendix at the end of this standard. Future addenda will be added to the standard as they are approved, in accordance with ASHRAE procedures for standards operating under continuous maintenance. 

ASHRAE's first ventilation standard, ASHRAE Standard 62-73, “Standard for Natural and Mechanical Ventilation” (see Reference ii), defined “…ventilation requirements for spaces intended for human occupancy and specified minimum and recommended ventilation air quantities for the preservation of the occupant’s health, safety, and well-being.” The standard provided a prescriptive approach to ventilation by specifying both minimum and recommended outdoor air flow rates to obtain acceptable indoor air quality for a variety of indoor spaces. Under the normal periodic review cycle, ASHRAE published the revised Standard 62-1981, “Ventilation for Acceptable Indoor Air Quality” (see Reference iii). The 1981 standard introduced the alternative air quality procedure
to permit innovative, energy conserving ventilation practices. This alternative procedure allowed the use of any amount of outdoor air deemed necessary if the designer could show that the levels of indoor air contaminants were held below recommended limits. ASHRAE Standard 62-1989
retained the two procedures for ventilation design, the Ventilation Rate Procedure and the Air Quality Procedure (see reference iv). The purpose of the standard was again to specify minimum ventilation rates and indoor air quality that will be acceptable to human occupants and are intended to minimize
the potential for adverse health effects.
Previous versions of the foreword of ASHRAE Standard 62 noted the importance of building operation, in addition to design, to achieving acceptable indoor air quality. Addendum 62l adds a new section to the standard on construction and ventilation system start-up, recognizing that acceptable indoor air quality is impacted by more than just the design of the HVAC system. Addendum 62m creates a new section on operation and maintenance procedures, recognizing the importance of operation and maintenance to achieving acceptable indoor air quality. These two addenda constitute a major improvement in the standard by adding specific requirements that will ensure that critical aspects of the ventilation system design are implemented in the building and remain functional throughout the life of the building. 

1. Purpose 
2. Scope 
4. Classification 
5. Systems and Equipment
6. Procedures 
7. Construction and System Start-Up
8. Operations and Maintenance 
9. References 
Appendix A: Conversion Factors 
Appendix B: Guidance for the Establishment of Air Quality Criteria for the Indoor Environment 
Appendix C: Rationale for Minimum Physiological Requirements for Respiration Air Based on CO2
Appendix D: Procedure for Use of Cleaned Recirculated Air 
Appendix E: Ventilation Effectiveness 
Appendix F: Rationale for Lag or Lead Time for Transient Occupancy
Appendix G: Rationale for Reducing Outdoor Air When Loads on a Multi-Zone System Are Unequal 
Appendix H: Addenda Description Information

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