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Filtration
technology can be divided into two basic contaminant removal
categories, particulate and gas phase. Particulate filters and
their performance are well quantified by method of test
standards. Using ratings incorporated in the ANSI/ASHRAE Standard
52.2 Method of Testing General Ventilation Air-Cleaning Devices
for Removal Efficiency by Particle Size HVAC contractors can
now readily match desired removal efficiencies with particulate
sizes to meet the needs of a customer.
Advancements in
particulate filtration have helped set the stage for the addition
of systems that filter recirculated air. This is turn allows to
reduce the required outdoor air intake resulting in operating cost
savings while still maintaining acceptable indoor air quality in
commercial buildings. This shift has been hampered by the lack of
established performance standards for filtration of gas phase
contaminants.
ASHRAE has been
developing a series of method of test standards for assessing the
performance of gas phase air cleaning equipment. The proposed
ASHRAE Standard 145.1P provides a standard laboratory test method
for assessing the performance of loose granular sorbent media used
in gas phase air cleaning systems. The proposed ASHRAE Standard
145.2P establishes a standard laboratory test method for assessing
the performance of sorbent media gas phase air cleaning devices.
The objectives
of this task are:
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