Silent damper is used.
How to use silent damper
1. Please check the position of the adjustment knob on the provided damper as figure 8.
2. Remove the existing roarer plate and place the provided damper flat on the fireball.
3. Preheat the stove including the damper, with alcohol or a torch for 30-40 seconds.
4. After preheating, apply pumping and ignite the stove.
Once the flame is lit, use a long screwdriver to adjust the knob slightly left or right,
depending on the flame condition, to achieve the optimal state.
Please refer to following urls.
https://www.youtube.com/watch?v=zhWbTzoKTME
https://www.youtube.com/watch?v=d90DVDlzKi0.