<p>An investigation has been made into the improvement of the efficiency of smoke precipitation by exposure of its particles to ultrasonic vibrations. Results are presented for investigations into the effect on smoke precipitation exerted by acoustic vibrations formed by two ultrasonic radiators operating at close frequencies compared to the effect of two radiators operating at one frequency. A possibility has been established for substantial improvement of the smoke precipitation efficiency by exposure of two radiators operating at one frequency. A two-frequency effect on smoke ensured not only the formation of smoke particle agglomerates along the direction of propagation of ultrasonic vibrations but also subsequent combination of agglomerates in the process of their rotational movement under the effect of low-frequency vibrations (beating) occurring due to the interaction of ultrasonic vibrations of different frequencies. A reduction in the energy expenditures on the process of smoke coagulation compared to other methods of its precipitation should be considered as the advantage of smoke precipitation under a two-frequency effect.</p>