Pair of replacement filters for PowerCap® Infinity®. Filters should be checked, maintained and replaced regularly to ensure the unit performs correctly. The length of a filters life depends on working application. These filters are high efficiency particulate types supplied in pairs. They will filter most particulate matter such as dust, spores, mist and fumes. They will not filter gases, vapours or toxic substances. Always replace both filters simultaneously. NEVER use compressed air on the filters. This will seriously limit protection.