Standard NBN EN ISO 21904-4:2020
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)
Status
:
Active
Publication date
:
4/2020
Languages
:
EN/FR/DE
ICS
:
13.100 Occupational safety. Industrial hygiene
25.160.30 Welding equipment
Summary :
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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