Air suction and filtering apparatus, comprising a dry filter (14) and a liquid bath filter (16), connected together in series, and suction means (21) able to create a flow of air between an inlet pipe (11), through the dry filter (14) and the liquid bath filter (16), and an outlet aperture (15), arranged downstream of the liquid bath filter (16). Between the dry filter (14) and the liquid bath filter (16) a mixing chamber (18) is arranged, independent of the two filters (14, 16), into which the air arriving from the dry filter (14) is able to be conveyed. The apparatus comprises a water introduction pipe (23), which is connected to the mixing chamber (18) in order to introduce water therein and obtain, in the mixing chamber (18), an air-water mixture able to be conveyed into the liquid bath filter (16).