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Home Energy Magazine Online May/June 1999
trends
in energy
New ASHRAE Ventilation Standard
Ventilation in the housing stock accounts for one-third
to one-half of the space conditioning load, primarily through uncontrolled
air leakage. Major energy savings can result from reducing air leakage,
but envelope tightening changes sometimes run the risk of causing indoor
air quality problems. To reduce this risk, the American Society of Heating,
Refrigerating and Air-Conditioning Engineers (ASHRAE) has proposed a new
ventilation standard for maintaining indoor air quality in residential
buildings. The proposed standard, 62.2P, is expected to be available for
public review and comment beginning May 1.
The proposed standard addresses three main issues:
whole-house ventilation, local exhaust, and source control. Because there
are different ways to achieve specified ventilation rates, the standards
were designed to allow users flexibility in employing either natural or
mechanical methods where appropriate. For example, while the standard allows
for infiltration and occupant use of windows to meet minimum ventilation
requirements in some climates, in areas with more severe climates and in
houses with barriers to the use of windows, mechanical ventilation is required.
Sound and flow rates for fans are also stipulated in the proposed requirements.
To read the full details on the proposed standard,
visit ASHRAE's Web site at www.ashrae.org.
Instructions for filing comments on the standard can also be found there.
Look for a discussion of the standard's development and implications in
the May 1999 issue of the ASHRAE Journal.
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