The plenum built with sintered expanded polyester is provided together with engines and rounded shutters.
The automatic managing of the shutter allows to the throttle to be settled in different prearranged position 0% - 33% - 66 % e 100%.
A by-pass compensates the air flow outgoing from the "Eolo" or "Mini Eolo" plenum, avoiding annoying noises.
The shockproof abs by-pass operates with the thrust of excess air due to the effect of the adjustable counter weight. A slight pressure is exerted on one side of the plenum. Make sure the aperture is directed downwards and the thrust of the bypass blade takes place by means of bolts. The counter weight is achieved by screwing nuts onto the bolts.