ISO 21904-4:2020
International Standard
Current Edition
·
Approved on
21 February 2020
·
Health and safety in welding and allied processes — Equipment for capture and separation of welding fume — Part 4: Determination of the minimum air volume flow rate of capture devices
ISO 21904-4:2020 Files
English
10 Pages
Current Edition
27.72 OMR
ISO 21904-4:2020 Scope
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.
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