Primary Containment

Secondary Containment

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Most safety cabinets should have two venting ports built into the
side of them.
One is located high up and the other is located lower down on
the opposite side. In some cases these bungs can be opened to
reduce vapour build up inside the cabinet.
If you open your cabinet and can smell strong vapours, or if the
cabinet has highly flammable liquids stored within it, you should
vent your cabinet.
There are two ways this can be done:

A cabinet could be vented to an open space that has good
ventilation e.g. a large workshop. Check with your supplier
that your cabinet has spark arrestors fitted in the venting
ports. Spark arrestors prevent sparks or flames accessing
the cabinet once the bungs are removed. To vent a cabinet
to the environment, simply unscrew both bungs with a drum
spanner or similar tool.

If the cabinet is located in a confined space you may
wish to vent to the outside atmosphere. The diagram and
instructions below outline one method of how this can be
1.Screw nipple and reducer into vent opening at base of
2.Slide weight support onto reducer, ensuring weight is
transferred to floor, rather than cabinet
3.Screw elbow onto reducer.
4.Place vent pipe through roof and ceiling penetration and
screw into elbow.
5.Cut off vent pipe at 1.0m minimum height above roof.
6.Rivet adaptor to vent pipe.
7.Rivet whirlybird to adaptor.
8.Seal roof penetration

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