The ISO 16890 standard, published by the International Standards Organization (ISO), consists of the following subsections under the main heading of "Air filters for general ventilation":
The ISO 16890-1 standard defines an efficiency classification system for air filters for general ventilation based on particulate matter. It also provides an overview of testing procedures and describes the requirements for evaluating and marking filters and documenting test results. This standard is intended for use with other parts of the series. It refers to particulate air filter elements for general ventilation with an ePM99 efficiency equal to or less than 1 percent when tested according to the methods defined in all sections of the standard. Air filter elements with a higher initial efficiency are evaluated by other applicable test methods. Performance results obtained in accordance with all parts of the ISO 16890 standard cannot be applied alone to predict performance in service in terms of efficiency and lifetime. Filter elements used in portable room air cleaners are outside the scope of this standard.
The ISO 16890-2 standard describes aerosol generation, test equipment and test methods used to measure the efficiency and air flow resistance of air filters for general ventilation. This standard is intended for use with other parts of the series. The lower limit for this test method is expected to be the lowest 20 percent ePM10 efficiency, as a test filter element below this level is very difficult to meet the statistical validity requirements of this procedure. Air filter elements outside of this aerosol fraction are evaluated by other applicable test methods.
The ISO 16890-3 standard describes test equipment and test methods used to measure the gravimetric efficiency and resistance to air flow of an air filter for general ventilation. This standard is intended for use with other parts of the series. Refers to particulate air filter elements for general ventilation that have an ePM99 efficiency greater than or equal to 1 percent and an ePM20 efficiency greater than 10 percent when tested according to the methods defined in all sections of the standard.
The ISO 16890-4 standard defines a conditioning method to determine the minimum fractional test efficiency. This standard is intended for use with sections 1-3 of the series and describes the conditioning method to be followed as well as the relevant test requirements for the tester and conditioning cabinet. Refers to particulate air filter elements for general ventilation that have an ePM99 efficiency greater than or equal to 1 percent and an ePM20 efficiency greater than 10 percent when tested according to the methods defined in other parts of the standard. The lower limit for this test method is expected to be the lowest 20 percent ePM10 efficiency, as a test filter element below this level is very difficult to meet the statistical validity requirements of this procedure. This standard can also be used by other standards that define or classify fractional efficiency where the results obtained are where the electrostatic removal mechanism is an important factor to consider.
The ISO/AWI 16890-5 standard describes the requirements and test method for measuring partial efficiency and airflow resistance for flat sheet filter media. This part of the standard is still under development.
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