CLF
Laminar crossflow-cabinet
Clean Air Techniek B.V.
UM-CLF-XX-EN05.doc
50
Appendix II: Replacement of the HEPA-filters
BE CAREFUL!!
Before starting service with the cabinet a written declaration “that the cabinet is
decontaminated” must be present. The responsible person (laboratory supervisor) will decide if
the cabinet has to be decontaminated so that when servicing the installation and the HEPA-
filters there is no danger for the service engineer, labour personnel, the laboratory and the
surroundings of the cabinet.
Clean Air Techniek B.V. strongly recommends special trained technicians to carry out filter
exchange. Certified service organizations are recommended. At all times keep to the written
procedures in this manual!
1.
When does a HEPA filter need to be replaced?
Under normal circumstances the serviceable life time of a HEPA filter is several years (mostly
between 5 and 10 years). The filter should be replaced whenever the air velocity and/or the filter
Integrity are no longer in compliance with the required specifications. The cabinet has a
microprocessor that is automatically regulating the fan speed to compensate for main power
fluctuations and filter pollution.
2.
replacing the HEPA-filter
Make sure that the cabinet has been properly decontaminated so as to ensure that no danger
exists for the service engineer, the laboratory personnel and the environment.
If the customer has a special procedure for the disposal of contaminated material, then this should
be followed. In case the service engineer does not think that this is sufficient, then proper
precautions should be made in consultation with the person responsible for the cabinet.
If there is no special procedure it is best to wear at least gloves and the protective clothing
normally worn during work with the cabinet. It is also advised to have a breathe protection e.g.
with a semi-facial mask with HEPA filters.
Supplies needed:
•
Plastic bag with closure (minimum measurement depends on the volume of the HEPA filter);
•
Two pair of gloves;
•
Semi-facial mask with HEPA filters;
•
Tools (knife, spanner or socket wrench, Alien key);
•
Tape;
•
Chemical disposal container or chemical disposal procedure.
Removing the old HEPA filter
•
Switch off the cabinet and pull out the power plug;
•
Put on the gloves and keep an extra pair ready for use;
•
Put on your breathe protection e.g. with a semi-facial mask with HEPA filters;
•
Remove the lower back panel;
•
Loosen the bolts of the pressure construction;
•
Take HEPA-filter out of the cabinet into a plastic back;
•
Remove the HEPA-filter conform the regulations;
•
Loosen the bolts of the pressure construction;
