ypramesh wrote:Does anybody have any idea what it is? I tried changing it but didn't recognize any change in the wind speed
The damper lever controls the damping of the fan. That in turn changes the drag factor on the flywheel which radically affects your rowing.
On a clean or brand new machine it makes the difference between pulling steadily and hauling the chain through a bath of syrup.
If the machine isn't clean, then the damper lever has less effect.
The PM2/PM2+/PM3/PM4 monitor measure the drag factor and uses that to compute the number of watts you're putting into the system. The monitor can also display the drag factor. On PM2/PM2+ press the [0/1] on/off button, then press [REST] and [OK] together. Row a few strokes to get the flywheel spinning and the drag factor will display in the bottom right corner of the display.
On PM3/PM4 there is a menu option for drag factor. Choose more options from the main menu, then choose display drag factor from that menu. Again row a few strokes to get the flywheel spinning and it will display the drag factor.
I do that before every session, I row on 108df. (Damper lever around 3.)
Search on here for "drag factor" it's one of the most frequently asked questions.