A Hepa-type filter, gives the user sub-micron particle filtration only. It is a filter that targets physical particulates only (PM2.5 and submicron particulates, ie less than 1 micron AKA ultrafine particulates) . As it is a single layer of filter media it has a lower inhalation resistance and is good for Hayfever sufferers and those people (Urban trainers) who want to keep the fine respirable exhaust dusts from entering the lungs, but still feel as though they can 'push' to the limit.
FILTER TYPE 3 - COMBINATION
(TECHNO FILTER AND CINQRO URBAN FILTER)
A 'COMBINATION' filter, gives the user both sub-micron particle filtration with gas and vapour filtration. It is a combination of the City filter and the Sports filter. The sub-micron filtration capability of the Sports filter means is that it is able to trap particles less than one micron in size combined with the City filter for vehicle exhaust gases. This combination is the perfect filter for general urban pollution attributed to cars, buses and lorries.