The bypass makes it possible to compensate the air flow out of the Eolo - Eolo Mini plenum, avoiding noise phenomena in the areas still open.
The by-pass, made of shockproof ABS, works by pushing excess air into the plenum.
The presence of adjustable counterweights will return it to position.
It is applied by slightly pressing on one of the two sides of the plenum.
Make sure the opening is facing downwards.
The counterweight is adjusted with multiple nuts screwed on the bolts.