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Standard

NS-EN ISO 21904-4:2020

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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.

Document information

  • Standard from SN
  • Published:
  • Edition: 2020-03
  • Version: 1
  • Document type: NAT
  • ICS 13.100
  • ICS 25.160.30
  • National Committee SN/K 58

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