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Filtration
Filter Table of Contents
| High
Temperature Filter Supplier
Although some air filter system components
are pre-qualified to operate in a given temperature range, the
air filter system designer must verify all components of
the system will function at the maximum and minimum
temperature conditions for the specified application. If the
temperature range of the specific application exceeds the
filters’ design qualification temperature, pre-qualification
is necessary to meet the operational and
design life requirements of the system.
In general, continuous operation at high
temperature (greater than 250 degrees Fahrenheit) is
detrimental to both HEPA filters and activated carbon-filled absorbers. At high temperatures, the shear strength of
adhesives and binders used in the manufacture of HEPA filters
and filter media may diminish, thereby limiting the safe
pressure drop to which they can be subjected. The limiting
temperature varies with the specific adhesive and binders
used. High temperature filter manufacturers have designed HEPA filters for
temperatures above 250 degrees Fahrenheit (a 500-degree
Fahrenheit filter is also available). The filter manufacturer
should provide objective evidence that the filters are
qualified for the higher-temperature environments of the
specific application.
For high-temperature applications,
particulate filtration can be accomplished with the use of
metal filters constructed of sintered metal or metal mesh.
Metal filters are manufactured for medium efficiency and HEPA
efficiency ranges. Due to their relatively high cost, metal
filters should be considered only for those applications
where standard glass fiber filters would not meet the
environmental or design conditions.
When temperatures higher than the operating
limits of air filter system components must be
accommodated, chilled water coils, heat sinks, dilution with
cooler air, or some other means of cooling must be provided
to reduce temperatures to levels that the components can
tolerate.
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