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Status : Active
Standard Type : Main
Document No : ISO 21904-4:2020
Document Year : 2020
Pages : 10
Edition : 1
Section Volume : Health and safety (ISO/TC 44/SC 9.)
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.