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It discusses the design considerations as they relate to humidity and does not mention microbial growth. The new paragraph 5.10 is titled Dehumidification Systems. The oft-quoted range of 30 to 60% humidity is contained in paragraph 5.10 of the 2001 standard. Paragraphs 5.10 and 5.11 from the 2001 standard discussed humidity and moisture intrusion and their relationship to microbial growth. Paragraphs 5.9, 5.10, and 5.11 from the 2001 standard were deleted and replaced. Figure 2 – Characteristics of particles and particle dispersoids, has been removed. Likewise, paragraphs 5.7 – Combustion Air, and 5.8 – Particulate Matter Removal, are now paragraphs 5.8 and 5.9. Paragraph 5.6 from the 2001 version, dealing with the use of local exhaust to capture contaminants was rewritten and renumbered as paragraph 5.7. New paragraphs 5.6.2 through 5.6.5 deal with rain entrainment and intrusion, snow entrainment, and bird screens, respectively. A new Table 5-1 has been included that specifies minimum air intake separation distances from such things as vents, chimneys, cooling towers, garbage storage, noxious or dangerous exhausts and other sources of hazards or odors. The new paragraph 5.6 is an important addition concerning the location of outdoor air intakes. The new paragraph 5.3 deals with exhaust duct location, and the new paragraph 5.4 discusses ventilation system controls. Paragraphs 5.3, 5.4, and 5.6 through 5-11 were replaced. Paragraph 5-2, concerning Ventilation Air Distribution, was rewritten. Section 5-Systems and Equipment has undergone extensive revision. ( Covered in Part 3 of this article) Section 5 The requirements for treating the outdoor air were revised and remain in Section 6. The revised outdoor air quality provisions in Section 4 only include requirements to investigate and document outdoor air quality. The outdoor air quality provisions of the previous version of the standard were in Section 6. Section 4 – Classification was deleted in its entirety and was replaced with a new Section 4 – Outdoor Air Quality. The definition of “breathing zone” from the ASHRAE standard is “the region within an occupied space between planes 3 and 72 in ( mm) above the floor and more than 2 ft (600 mm) from the walls or fixed air-conditioning equipment”. It is the area from which the employee draws air and has been defined as being as close as possible to the nose and mouth and a hemisphere forward of the shoulders with a radius of 6 to 9 inches. A “Breathing Zone” in Industrial Hygiene terminology refers to the area that one takes a personal air sample in for industrial hygiene air sampling. The use of this term may cause some confusion for those familiar with Industrial Hygiene terminology. The new definition for “breathing zone is essentially the same as the definition for “occupied zone” from the previous standard.
#Air sample breathing zone code
This allows for code enforcement agencies to incorporate provisions of the standard and then be able to fully enforce the requirements. Many sections of the standard have been rewritten into “mandatory and enforceable language”.
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The Standard numerical designation was changed from 62 to 62.1 because a separate new standard, “62.2 – Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings”, was developed.In fact, there is relatively little that has not been changed. This standard incorporates 17 addenda that delete and/or replace many of the sections of the previous standard. The ANSI/ASHRAE Standard 62.1-2004 Ventilation for Acceptable Indoor Air Quality incorporates a number of significant changes to the previous standard – 62-2001. The first installment reviewed changes in the use of carbon dioxide as an indicator of indoor air quality. This article is the second installment of our Review of ANSI/ASHRAE Standard 62.1-2004. Ventilation for Acceptable Indoor Air Quality