The resistive silencer absorbs sound energy by means of porous sound-absorbing materials laid inside the airflow passage, so as to reduce noise propagating along the duct. It delivers excellent silencing performance for medium and high frequency noise.
Brief Introduction to Measured Performance of Silencer
| Frequency | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 | 10000 | |
| Working Condition | ||||||||||
| Bare Duct | Static State | 65.0 | 71.0 | 95.5 | 97.0 | 90.5 | 90.5 | 77.5 | 60.5 | 84.5 |
| 3m/s | 65.5 | 71.5 | 95.5 | 97.0 | 90.5 | 90.5 | 77.5 | 60.5 | 84.5 | |
| 6m/s | 66.5 | 71.0 | 95.5 | 97.0 | 90.5 | 90.5 | 78.0 | 60.5 | 84.5 | |
| 9m/s | 68.5 | 71.5 | 95.5 | 97.0 | 90.5 | 91.0 | 78.0 | 60.5 | 84.5 | |
| With Silencer Installed | Static State | 64.5 | 70.5 | 87.5 | 82.5 | 72.5 | 79.5 | 69.0 | 55.5 | 69.5 |
| 3m/s | 64.5 | 71.0 | 87.5 | 82.5 | 71.5 | 79.5 | 69.5 | 55.0 | 69.5 | |
| 6m/s | 66.0 | 70.5 | 87.5 | 93.0 | 71.5 | 79.5 | 70.0 | 55.0 | 70.0 | |
| 9m/s | 68.0 | 71.0 | 87.5 | 93.0 | 71.5 | 80 | 70.0 | 55.0 | 70.0 | |
| Noise Reduction | Static State | 0.5 | 0.5 | 8.0 | 14.5 | 18.5 | 11.0 | 8.5 | 5.0 | 15.0 |
| 3m/s | 1.0 | 0.5 | 8.5 | 14.5 | 19.0 | 11.0 | 8.0 | 5.5 | 15.0 | |
| 6m/s | 0.5 | 0.5 | 8.0 | 14.0 | 19.0 | 11.0 | 8.0 | 5.5 | 14.5 | |
| 9m/s | 0.5 | 0.5 | 8.0 | 14.0 | 19.0 | 11.0 | 8.0 | 5.5 | 14.5 | |
Note: When the air velocity is 3 m/s, the pressure loss ΔH = 1.0 mmH₂O;
when the air velocity is 6 m/s, the pressure loss ΔH = 2.0 mmH₂O;
when the air velocity is 9 m/s, the pressure loss ΔH = 5.5 mmH₂O.