Despatch LCC/LCD2-14-3 Non Pass Through Series - Manual (Page 27)

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Handling
The filter is shipped in the original carton or package that the filter manufacturer uses.
This will give good storage and maximum protection from dirt and moisture.
HEPA filters should be stored and moved in the shipping carton with in the upright
position. Handling should be kept to a minimum. During installation the filter should be
removed from the shipping carton and installed directly into the oven.
If for any reason an unpackaged filter unit must be placed with its face on the floor or
other surface, the surface must be cleared of every object or irregularity, which might
damage the filter pack.
HEPA Filter Validation Testing
This section describes the Despatch position and recommendations for HEPA filter
testing and oven validation procedures. Despatch guarantees that the filters will meet
specified efficiency ratings when the filter is:
properly installed
run at or below 180°C, at a constant temperature
burned off at 260°C for 48 hours before running
D.O.P. Testing
In D.O.P. testing, aerosol particles of submicron size are used to spot defects or
measure filter efficiency. Degenerative by-products of this test are distributed
throughout the oven chamber upon heat-up. These and other organic challenge agents
also present a fire hazard for this non-Class A (NFPA 86) oven. Therefore Despatch
does not recommend D.O.P. filter testing.
Class 100 Testing
Despatch guarantees the environment within the oven to be Class 100. This
classification is based upon measurement of the particulate level within the oven work
chamber.
Class 100 testing may be performed before or after a proper filter burn-off procedure
has been performed. Despatch will guarantee Class 100 conditions measurements
based on the direct method of test employing an extraction-type particulate analyzer.
An indirect method of testing involves particle settling over a specified period of time
onto a clean disk. Please consult the factory for expected levels.