Expanded and revised for , both standards specify minimum ventilation rates and other measures in order to minimize adverse health effects for occupants. Standard Significant updates to the edition include the following: The scope is changed to remove commentary and to more specifically identify occupancies previously not covered. Informative tables of ventilation rates per unit area are included for checking existing buildings and design of new buildings. The Ventilation Rate Procedure is modified with a new simplified version for determining Ev and a more robust option for determining values of Ez. The Natural Ventilation Procedure is significantly modified to provide a more accurate calculation methodology and also define the process for designing an engineered system.

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Entitled "Ventilation For Acceptable Indoor Air Quality" it has become a world wide reference document for building designers, code makers and other regulatory bodies in the design and operation of ventilation systems in buildings. The goal is to ensure good air quality for building occupants. Deviation from these standards opens the design engineer to significant liability if indoor air quality problems result.

The majority of building regulations and codes in the country derive their required ventilation rates from ASHRAE standard It has a enormous impact on our day to day lives.

This little known society has a critical influence on the quality of indoor air we breath every day. For example, the recommended outside air ventilation rate of 15 cfm per person cubic feet per minute has become a world wide baseline for building ventilation. What is an "Interpretation" To The Standard? From time to time, situations, or conditions arise where it is difficult to determine if a particular design technique or control approach meets the standard.

This can be a result of changes in technology or the occurrence of a particular situation not considered by a standard when it was first written. To handle such situations, ASHRAE has developed a process that allows interested individuals to submit questions that can clarify uncertainties and ambiguities that relate to the standard.

This is called an interpretation. Anybody can submit an interpretation to a standard. Interpretations are written documents that generally describe the factors in the standard that affect or cause uncertainty to a particular application or practice. A interpretation describes how the author believes the particular situation that is of concern should be handled.

A committee established by ASHRAE of a diverse group of its members then reviews the interpretation and decides whether the interpretation is correct or not. If accepted by the committee, the interpretation becomes part of the standard. People exhale CO2 at a very constant and predictable rate. In addition outside CO2 levels tend to be very low and constant typically around ppm. An indoor measurement of CO2 is a dynamic measurement of the number of people in a space generating CO2 and the amount of low concentration fresh outside air being brought in to dilute or purify the inside air.

As a result a indoor CO2 measurement can be a good indicator of the amount of fresh air being delivered to a space. A high CO2 level, say over ppm would indicate a space was poorly ventilated. Typical symptoms of poorly ventilated spaces vary by individual but can range from general irritability and sleepiness to strong physical reactions causing stress and illness.

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Interpretations for Standard 62-1989



Read-Only Versions of ASHRAE Standards


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