The life of a gas cartridge is dependent upon the temperature, humidity, concentration and type of contaminant, the class of filter and the selected flow rate of blower. Filters should be replaced on a regular basis in accordance with an established filter replacement schedule identified in the initial risk assessment. AS/NZS 1716: 2012 recommends discarding your filter when any one of the following conditions exists:
- The particulate filter becomes difficult to breathe through
- Calculated breakthrough of gas occurs according to the filter replacement schedule identified during the risk assessment
- 6 months have passed since sealed gas/vapour filter package has been opened (if expected breakthrough hasn’t occurred earlier)
- The expiry date on the filter has passed.
In some instances, depending on the type of chemical hazard, filters must be changed out after each shift.
If filters are to be re-used they should be stored in a sealed plastic bag or box.
Filter classifications:
Particulate Filters are classified as P1, P2
or P3:
- P1 filters suitable for mechanically generated particles
- P2 filters suitable for mechanical & thermally generated particles
- P3 filters suitable for mechanical, thermally generated particles & highly toxic
Gas filters are rated Class 1, Class 2 or Class 3 according to their capacity to capture and hold certain gas/vapours. The classification for gas & vapour filters is based on the groups of gases they are designed to be most effective against. Filters have colour-coded labels for easy identification of the different groups.
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