Crushing device provided with an exhaust system and method for crushing heterogeneous chunks of material

A crushing device configured to crush heterogeneous chunks of material, said crushing device comprising a crusher of the jaw crusher type provided with two jaws, at least one jaw of which moves reciprocally toward the other jaw and away from the other jaw in use so as to crush material that is present between the jaws, which jaws define a crushing space together with two bounding elements extending beside the jaws, parallel to the direction of reciprocation of the at least one jaw, a supply device configured to supply the material to be crushed to the jaw crusher and a discharge device configured to discharge material processed, which is at least partially crushed, by the jaw crusher, wherein the material flows from the supply device, through the crushing space, to the discharge device in a downstream direction of flow, wherein the crushing device comprises a housing that encloses the jaw crusher, at least one first ventilation device provided with an air outlet opening that opens into the crushing space, which ventilation device is configured to blow air under pressure between the jaws of the jaw crusher device and in upstream direction into the crushing space, and a first exhaust device which, in use, exhausts air mixed with fine material produced by the jaw crusher from the housing, wherein the exhaust device is configured to convey the fine material mixed with the air to a collecting location.