Page 3 - Westbury Filtermation Catalogue
P. 3

ISO 16890 Overview

               The provision of clean air to breathe is one of life’s essentials. For many years this has been
               overlooked to the point where currently over 73% of airborne particulate matter is manmade –
               from combustion, emissions and industrial processes.
               Generally the air quality in a building will reflect the air quality outside the building unless
               conditioned air is provided. Local authorities and Government are now legislating for the quality
               of air within a building to be to an acceptable standard and the occupants to be protected from
               particulate contamination.

               To simplify the classification of air the airborne particulates are indexed under four headings
               these are:-

               PM Course - Particles with a diameter greater than 10 μm
               PM10 - Particles with a diameter of less than 10 μm

               PM2.5 - Particles with a diameter below 2.5 μm

               PM1 - Particles with a diameter below 1 μm
               Note: 1 μm (micron) is 1 millionth of a metre or 1/25,400  of an inch.

                                                       As the particle sizes become smaller they become more

                                                       dangerous the human respiratory system, with PM1
                                                       (sub-micron) particles able to deeply penetrate the

                                                       capillary vessel walls within the lungs, with long term

                                                       exposure causing serious adverse health conditions

                                                       including; arteriosclerosis, adverse birth outcomes and
                                                       respiratory diseases in children.

                Testing Air filters

                The European test standard (EN 779), based on a test procedure around 40 years old, the test is
                based on measuring the efficiency of filters based on exposure to a synthetic test aerosol with a
                uniform particle size of 0.4 μm and classifying filters to a range of efficiencies ratings from M5 to
                F9, however, these results are not indicative of a filters performance in a real life environment.
                To rectify this the air filtration industry has now adopted a new testing method whereby filters can
                be selected based on the air quality demands of each and every specific area.
                Where Outdoor Air quality (OAQ) is poor and Indoor Air Quality (IAQ) needs to be good, the filters
                can be selected to accomplish this.
                Here’s how: -
                ISO 16890

                The new international ISO 16890 standard defines four new filter groups based on dust particle
                ■ ISO Coarse
                ■ ISO PM10   particle size ≤ 10 μm
                ■ ISO PM2.5   particle size ≤ 2.5 μm
                ■ ISO PM1     particle size   ≤  1 μm
                If this looks familiar, it’s because it follows the same format as the way Governments and Local
                Authorities index them - as previously mentioned above.
   1   2   3   4   5   6   7   8