e. Air purifiers. Air purifiers will be installed on the return air system in hardened facilities to
remove tobacco smoke and objectionable odors from areas such as toilets and kitchens when the facility is
in a button-up condition. Normal odor control is by dilution of return air with fresh air. Activated carbon
filters are normally installed in a bypass section of the return air ducts and are activated by means of
motorized dampers when the button-up signal is received. The commercial carbon filters normally used
in this application are not suitable for CB service because they do no contain carbon specifically treated to
sorbe CB agents.
TABLE 4-1
Performance
of
Dry
Media
Particulate
Filters
Classification
Parameter
Medium
High
Extreme
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