Status
Gældende
Type
Standard
Varenummer
M330912
Udgivelsesdato
2020-03-19
Komite
CEN/TC 121
ISO/TC 44/SC 9
International arbejdsgruppe WG
CEN/TC 121
ISO/TC 44/SC 9
Internationale relationer
ISO 21904-4:2020 IDT, EN ISO 21904-4:2020 IDT
Dansk udvalg
Antal sider
24
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.