Despatch Stackable LCC/LCD - Manual (Page 18)

T HEORY OF O PERATION Stackable LCC/LCD Oven Owner’s Manual
18 Version 26
Copyright © 2010 by Despatch Industries.
All rights reserved. No part of the contents of this manual may be reproduced, copied or transmitted in any form or by any
means including graphic, electronic, or mechanical methods or photocopying, recording, or information storage and
retrieval systems without the written permission of Despatch Industries, unless for purchaser's personal use.
The filter is typically shipped in the original carton or package provide 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.
3.3.3. HEPA Filter Validation Testing
Despatch Industries guarantees the HEPA filters will meet specified efficiency ratings
when the following recommendations are followed:
The filter is properly installed
The filter is run at or below 200°C, at a constant temperature
The filter is run before burn-in
3.3.3.1. D.O.P. Testing
Caution!
Despatch does not recommend D.O.P. filter testing.
D.O.P. testing uses aerosol particles of submicron size to spot defects or measure filter
efficiency. Degenerative by-products of this test are distributed throughout the oven
chamber upon heat-up. Despatch does not recommend D.O.P. filter testing.
3.3.3.2. Class 100 Testing
Despatch guarantees a Class 100 environment within the oven. This classification is
based on measurement of the particulate level within the oven work chamber.
Class 100 testing may be performed before or after a proper filter burn-in procedure has
been performed. Despatch guarantees Class 100 condition measurements based on two
methods of test. The direct method employs an extraction-type particulate analyzer. The
indirect method involves particle settling over a specified period of time onto a clean
disk.