Standard

SN EN ISO 21904-4:2020

Current

Existing or new amendments and versions must be purchased separately.

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Abstract

This document specifies two methods for establishing the minimum air volume flow rate. One method is dedicated for use with captor hoods, nozzles and slot nozzles with a ratio of slot length to hose diameter of 8:1 or less. The other method is dedicated for use with on-gun extraction devices. These methods are not applicable to down draught tables.

Products specifications

  • Standard from SWISSMEM
  • Published:
  • Effective:
  • Document type: EN
  • Pages
  • ICS: 13.100
  • ICS: 25.160.30
  • Publisher: SWISSMEM
  • Distributor: SNV
  • National Committee: Swissmem/NK 20
  • European TC: CEN/TC 121
  • International TC: ISO/TC 44

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