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

Size: 1.17 MB
  • Report #: NT VVS 128
  • Approved: November 2001
  • Hits: 0


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.


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”.