Back draught shouter
Back draught shouter with spring-loaded blades is designed to automatically shut off circular air ducts when the fan is switched off.
| Type | Pcs/packs |
| D100 | 100 |
| D125 | 100 |
| D160 | 64 |
| Type | Pcs/packs |
| D200 | 36 |
| D250 | 12 |
| D315 | 12 |
| D355 | 6 |
| D400 | 6 |