The invention concerns a device for filtering gas comprising a microporous or microfibrous adsorbent filter (6) and means for forcing an air flow between an exhaust hood (2) and outlet duct (3) for the filtered air. The invention is characterized in that it comprises liquid spraying means (18) and centrifuging means arranged between the spray means and the filtered gas outlet. The particles wetted by the sprayer are blocked by the internal rotary filter and discharged with the carrier liquid towards an external container (10).