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25 \ USER OPERATION MANUAL: Purair Basic Series
VI . Maintenance
6.1 General
In some countries it is mandatory to maintain written records of checks, tests and repairs carried out on safety
equipment. These records must be kept for 5 years. A full list of Occupational Exposure Limits should be
obtained from your safety officer.
Regular preventative maintenance on the cabinet will reduce the possibility of hazard to the operator and
ensure reliable performance from the cabinet.
WARNING! Before attempting inspection and repairs to the cabinet, please ensure main power to
the system has been removed and that the power lead has been removed. It should also be noted that
fume cabinets are sometimes used to contain and protect users of the cabinet from hazardous
or harmful substances. Before commencing this schedule it is important to ensure the cabinet is safe
to work on.
6.2 General Cleaning
Wipe down the unit with only soapy water.
6.3 Pre-Filters
Check condition and replace if required.
6.4 Lights
Ensure that the light diffuser is clean before switching the system on. Check that the light is in working
condition.
6.5 Airflow
Check and record the inflow air velocity at the working aperture as follows: Using a calibrated hot wire or vane
anemometer or similar approved airflow meter, take a minimum of 5 readings across the fume cabinet aperture
as shown below. Calculate the average airflow, which should be greater than 0.5 m/sec or 100 fpm +/- 10%.
The readings should be recorded on the service sheet or system log.
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