New ISO draft standard on filter testing available from IEST

Published: 5-Apr-2007


The first document produced by the International Organisation for Standardisation Technical Committee (ISO/TC) 142, Cleaning equipment for air and other gases.

ISO/DIS 21220 Particulate air filters for general ventilation-Determination of the filtration performance is available from the US-based Institute of Environmental Sciences and Technology (IEST), Administrator of the US TAG to ISO/TC 142.

ISO/DIS 21220 describes testing procedures and the test rig for measuring performance of particulate air filters in general ventilation applications. The document presents two test methods based on the initial efficiency of the filters and the conditioned efficiency of their media: the “fine method” for air filters in the higher efficiency range and the “coarse method” for lower efficiency filters.

In addition, the Standard contains annexes covering a test method for conditioning of filter material, pressure drop calculation, and shedding from filters.

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