We have three kinds of filters:

DACC (City filter/ Metro filter / Xtreme Urban filter)
Hepa-Type (Sports filter / Cinqro sports filter / Allergy particle filter)
Combination filter (Techno filter / Cinqro Urban filter / Allergy chemical/particle filter)

FILTER TYPE 1.
The DACC filter is used for the removal of Acid gases and Organic vapours associated with vehicle emissions. It has a particle filtration layer that removes PM10 but is not sub micron.

FILTER TYPE 2.
A Hepa-type filter, gives the user sub micron particle filtration only. It is a filter that targets physical particulates only (PM2.5 and sub micron particulates, i.e. less than 1 micron AKA ultra fine particulates). As it is a single layer of filter media it has a lower inhalation resistance and is good for hay fever 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.
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 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.