BS EN ISO 21904-4:2020

Health and safety in welding and allied processes. Equipment for capture and separation of welding fume. Determination of the minimum air volume flow rate of capture devices | Status: Current, Project Underway

1 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.