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.
Status: PublishedPublication date: 2020-02
Edition: 1Number of pages: 10
Technical Committee: ISO/TC 44/SC 9 Health and safety
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ISO 21904-4:2020Stage: 60.60
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