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Filtration Table of Contents
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Moisture is an important consideration in air
cleaning system design. Moisture in the air may affect the
performance of the air cleaning system by binding the
particulate filters and/or blocking pores and fissures in the
activated charcoal. Where water mist or steam can be expected
under either normal or upset conditions, moisture separators
and heaters, if appropriate, must be provided upstream of the
filters to prevent plugging, deterioration, and reduced
performance. Condensation from saturated air and gas streams
or carryover from air washers and scrubbers are common
sources of moisture. When fire-protection sprinklers are
provided in operating areas, ducts, or plenums, moisture can
be drawn into the filters if they are activated.
Moisture on the face of a filter will blind
or plug the filter, creating the potential for filter
failure. [Note: HEPA filters exposed to carryover from
intentional or inadvertent excessive moisture exposure should
be replaced.]
Condensation is particularly troublesome when
filters are installed in underground pits, in outdoor
housings, or in unheated spaces within buildings. Even when
the air entering through the ducts is above the dew point,
duct walls, dampers, or filters may be cold enough to cause
condensation on their surfaces. Condensation can also take
place in standby systems. Inspection of standby filters on a
monthly or even weekly basis is recommended to prevent the
detrimental effects of condensation.
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