• ONORM EN 1822-5 : 2011

    Withdrawn A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

    HIGH EFFICIENCY AIR FILTERS (EPA, HEPA AND ULPA) - PART 5: DETERMINING THE EFFICIENCY OF FILTER ELEMENTS

    Publisher:  Osterreichisches Normungsinstitut/Austrian Standards

    Published: 

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