CEN/TC 121
| Project No. | EN ISO 21904-4:2020 |
|---|---|
| Title | 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. |
| Registration number (WIID) | 64149 |
| 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. |
| Status | Standarts spēkā |
| ICS group | 25.160.30 13.100 25.160.01 |