Abstract: A blower fan comprises a support element (13) presenting a first face (13a) and a second face (13b) mutually opposite to said first face (13a), the first and the second faces (13a, 13b) being respectively invested at least by a first and a second air flows (10, 11) coming from mutually opposite directions, a first blade series emerging at least from said second face (13b), and at least one air passage (13c) provided in the support element (13) and adapted to direct at least said first air flow (10) investing said first face (13a) at least partly through said support element (13).

Abstract: A blower fan comprises a support element (13) presenting a first face (13a) and a second face (13b) mutually opposite to said first face (13a), the first and the second faces (13a, 13b) being respectively invested at least by a first and a second air flows (10, 11) coming from mutually opposite directions, a first blade series emerging at least from said second face (13b), and at least one air passage (13c) provided in the support element (13) and adapted to direct at least said first air flow (10) investing said first face (13a) at least partly through said support element (13).

Abstract: A multi-purpose blowing apparatus is provided, in particular for use in the agricultural field and the like, comprising an engine (2), a fan wheel (3) moved by the engine and adapted to generate a delivery air flow (4), and a volute header (5) surrounding said fan wheel (3) and adapted to convey said delivery flow (4) towards use means; said fan wheel comprises a support element (13) presenting a first a second face (13a, 13b) mutually opposite and respectively invested by a first and a second air flows (10, 11) coming from mutually opposite directions, a predetermined number of blades emerging from said second face (13a) and at least one air passage (13c) provided in the support element (13) and adapted to direct at least said first air flow (10) through said support element (13).