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The filter is typically shipped in the original carton or package provided by the
filter manufacturer. This carton or package provides good storage and maximum
protection from dirt and moisture. Store and move HEPA filters upright in the
shipping carton. Minimize handling of the filter. During installation, remove the
filter from the shipping carton and install directly into the oven.
If an unpackaged HEPA filter unit must be placed with its face on the floor or
other surface, clear the surface entirely of every object or irregularity which might
damage the filter pack.
4.3.3. HEPA Filter: Magnehelic Pressure Gauge
The LCC Series oven is equipped with a Magnehelic
pressure gauge which measures the pressure in front
of the HEPA filter (Figure 7). As the filter becomes
dirty, pressure increases. Despatch recommends
changing the filter when the pressure is 1” w.c.
greater than when the filter was first installed (Refer
to Section 5.3 for filter replacement).
Since pressure can be affected by many factors
involved in the installation, it is important to
record the pressure of a new filter as a
baseline. Recorded pressure readings allow for
new readings to be periodically checked
against this baseline. Use Table 10 for
recording this information.
For a nitrogen atmosphere oven, pressure readings also give an indication of the
integrity of the seals. If the pressure recorded in Columns D or E decrease over
time, inspect the oven seals.
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