Civil Engineering Reference
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environment is not contaminated or by orienting the building air intakes in such
manner that they are not faced with the direction of prevailing wind carrying con-
taminations this target could be achieved.
The next step towards protecting the building against entrance of contaminants is
using high quality fi lters on air handling units which are serving as the outdoor air
providers to the building. These fi lters are usually specifi ed by their Minimum
Effi ciency Reporting Value (MERV) which is a value between 1 and 20 and the
fi lter effi ciency and collection capacity increases as the MERV number increases.
Furthermore providing suffi cient exhaust from interior spaces with high levels of
pollution or undesired chemical elements and keeping the proper relative pressure
between these spaces and the rest of the building is very important to create a
pollution-free space inside the building. For a detail discussion on indoor air quality
see ASHRAE Indoor Air Quality Guide (ASHRAE 2009 ) .
References
ASHRAE (2013) ANSI/ASHRAE Standard 62.1-2013. ASHRAE Standard, Ventilation for accept-
able indoor air quality. American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc., Atlanta, GA
ASHRAE (2009) Indoor air quality guide, best practices for design, construction, and commis-
sioning. American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.,
Atlanta, GA
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