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

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

Abstract

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.