Items tagged with AIR FILTER Files

File size: 1.17 MB Download

Ventilations filters: Field test of efficiency (NT VVS 128)

NT VVS 128

  • This Nordtest method is intended to be used in testing ventilation filters in their normal operating conditions. The purpose of the test is to determine if the fractional efficiency of the filter(s) differs significantly from that expected from the laboratory tests.

File size: 97.99 KB Download

Electret filters: Determination of the electrostatic enhancement factor of filter media (NT VVS 117)

NT VVS 117

  • This Nordtest method is intended to be used in the testing of fibrous filter materials, The purpose of the test is to determine whether the efficiency of a filter material is dependent on the electrostatic removal mechanism and to provide quantitative information about the importance of the electrostatic removal mechanism.

Nordtest

Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.