A blower/atomizer device, preferably of the portable type, comprising: - a propulsion assembly or power unit, adapted to generate a mechanical power; - a blowing assembly connected to said propulsion assembly and adapted to energise and convey an air flow - a flexible swingable dispenser defining a median axis and adapted to emit and direct a flow set in motion by the blowing assembly along said median axis; and - an adjusting assembly operatively acting in said swingable dispenser for selectively introducing a predetermined amount of substance "S" to be distributed/atomized, into said flow, said device further comprising synchronised actuating means simultaneously acting on the swingable dispenser so as to vary a flowrate in said swingable dispenser resulting from the air or substance amount to be introduced and mixed into the air flow generated by said blowing assembly, and the propulsion assembly so as to vary delivery of mechanical power; wherein said synchronised actuating means comprises a handgrip or handle to be grasped by a user/operator, said handle being connected to the swingable dispenser, characterized by including: - at least one actuating slider movable between an operating-minimum condition and a maximum use condition; - a first kinematic actuating mechanism operatively connected to said actuating slider; - flow adjusting means interlocked with said first kinematic actuating mechanism, said flow adjusting means including a valve element adapted to adjust a pressure and/or a flowrate; - a second kinematic actuating mechanism operatively connected to said actuating slider; - means for adjusting the propulsion assembly interlocked with said second kinematic actuating mechanism, said means for adjusting the propulsion assembly comprising an element adapted to adjust a rotation speed of the propulsion assembly, said means for adjusting the propulsion assembly being in functional coordination with and substantially in direct structural independence of said flow adjusting means. - a propulsion assembly or power unit, adapted to generate a mechanical power; - a blowing assembly connected to said propulsion assembly and adapted to energise and convey an air flow - a flexible swingable dispenser defining a median axis and adapted to emit and direct a flow set in motion by the blowing assembly along said median axis; and - an adjusting assembly operatively acting in said swingable dispenser for selectively introducing a predetermined amount of substance "S" to be distributed/atomized, into said flow, - at least one actuating slider movable between an operating-minimum condition and a maximum use condition; - a first kinematic actuating mechanism operatively connected to said actuating slider; - flow adjusting means interlocked with said first kinematic actuating mechanism, said flow adjusting means including a valve element adapted to adjust a pressure and/or a flowrate; - a second kinematic actuating mechanism operatively connected to said actuating slider; - means for adjusting the propulsion assembly interlocked with said second kinematic actuating mechanism, said means for adjusting the propulsion assembly comprising an element adapted to adjust a rotation speed of the propulsion assembly, said means for adjusting the propulsion assembly being in functional coordination with and substantially in direct structural independence of said flow adjusting means.