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Exhaust HEPA Filter (Air ducted to atmosphere) – 4.3
The HEPA filter is located on the top of the main body of the cabinet held in place by four M8
filter bolts.
Warning
To remove filter, release bolts, lift module until filter can be removed. Slide the filter forward
and out and dispose of as recommended by site regulations.
To replace, first ensure that all surfaces have been cleaned and are free from matter.
Remove new filter from its protective packing.
Inspect both exposed surfaces for signs of damage. Any damage should be reported to the
supplier immediately.
Slide filter carefully into position. Tighten bolts, ensuring filter is correctly positioned and
gaskets are compressed to about half their original thickness.
The filter and its gaskets should be tested for leaks by challenging with DOP or equivalent
aerosol and scanning the surface with the probe of a forward light scattering photometer.
Ensure the Safety Cabinet is isolated from the
mains supply prior to opening access panels.
IMPORTANT
Cabinet must be decontaminated prior to changing any HEPA filters, see section 2.6
Only replace or examine filters if authorised to do so by the Safety Officer or the person in
charge of the laboratory. To remove any filters wear disposable gloves, an apron, overalls
and appropriate face covering, especially eye protection.