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5.2.
ABSOLUTE FILTERS
The average life of HEPA filters in these cabinets is 4000/5000 hours.
After this time, the propelled airflow falls because of the increased loss of load of the filter as
it is a mechanical filtering, although this does not mean that filtering efficacy is reduced.
When it reaches the minimum flow measured by the thermoanemometric probe, the
microprocessor activates both visual and acoustic alarms.
WARNING
Do not replace absolute filters or directly handle fans in the microbiological safety cabinets
without having first wiped the area down with vaporized hydrogen peroxide or formaldehyde
(the latter not recommended). Opening the cabinet without taking the proper precautions
can endanger your health. We recommend it is carried out by staff especially trained for this
work.
When using formaldehyde the laws in force in each country must be followed.
To ensure correct installation and adjustment of the filter, as well as ensuring there are no
leaks, filters should be replaced by specialised technical staff equipped with the
corresponding monitoring instruments: anemometer, leak detector, aerosol generator,
particle counter, etc.
The used clogged absolute filters from safety cabinets should be destroyed. This process is
always the responsibility of the user. Our technical service does not have any responsibility
for possibly contaminated parts.
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