ISO DIS 16890-4

Description / Abstract: This part of ISO 16890 establishes a conditioning method to determine the minimum fractional test efficiency. It is intended for use in conjunction with ISO 16890-1 and ISO 16890-2 and provides the related test requirements for the test device and rig as well as the conditioning procedure to follow.

The test method described in this standard is referring to a test rig with a nominal face area of 610 mm x 610 mm (24 inch x 24 inch).

ISO 16890 (all parts) refers to particulate air filter elements for general ventilation having an initial efficiency less than or equal to 99% with respect to PM1 aerosol fraction and greater than 20 % with respect to PM10 aerosol fraction when tested per the procedures defined within parts 1-4 of ISO 16890.

Air filter elements outside of this aerosol fraction are evaluated by other applicable test methods, (see ISO 29463, part 1-5).

Filter elements used in portable room-air cleaners are excluded from the scope of this standard.

The performance results obtained in accordance with this series of standards cannot by themselves be quantitatively applied to predict performance in service with regard to efficiency and lifetime.

The results from ISO 16890-4 may also be used by other standards that define or classify the particle removal efficiency in the size range of 0,3 to10 μm when electrostatic removal mechanism is an important factor to consider, for example ISO 29461