Labconco FilterMatPortable Exhausters 3970024 - Manual (Page 33)

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C C
H H A A P P T T E E R R
5 5
M M
A A I I N N T T A A I I N N I I N N G G
Y Y
O O U U R R
F F
I I L L T T E E R R
M M
A A T T E E
Monitoring and changing the filters is the primary maintenance
required. The following maintenance schedule is recommended:
Monthly (or more often as required)
Test filter condition on carbon filtered models using a gas detector
tube at intervals of 20% of the total estimated time. The exception
to the 20% recommendation is formaldehyde or any carcinogen or
suspected carcinogen. These hazardous chemicals must be
checked at least every 10% of the total estimated time. Gas
detector tubes for the specific chemicals that are being used in the
enclosure can be obtained from your laboratory supply dealer.
Check face velocity on HEPA filtered models. Increase speed
control or change HEPA filter when face velocity of the enclosure
drops below the recommended speed for your facility or if the
airflow alarm alerts you. Airflow alarms are recommended.
Replace carbon filters when chemical breakthrough is indicated by
odor, time, detector tube, or for some chemicals, analytical
instrumentation. See “Replacing Filters” section of this manual in
Chapter 5.
CARBON
CARBON
HEPA