The third filtration stage is designed to completely clean the remaining air to a standard far higher than the surrounding ambient air.
Using a HEPA filter, this final stage ensures that fine, sub-micron particles (trace oil, smoke, bacteria, pollen and spores) are trapped and not allowed to return to the workshop.
HEPA filters (grade H13 EN1822) operate at 99.95% efficiency at 0.3 µm. This means that in a workshop environment, effectively all hazardous particles are trapped ensuring only clinically clean air is returned to the workshop.
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