In agricultural premises, the air environment contains many pathogenic microorganisms. The spread of microorganisms occurs from animals, room surfaces, with ventilation air from wet feeds. Microorganisms spread over long distances with the help of aerosols. Retention of various microorganisms on aerosols can take up to four hours. To exclude infection, it is necessary to clean, disinfect and deodorize the air. The purpose of the work is to increase the efficiency of air disinfection in agricultural premises. Measurements of microbial contamination of the air were made by bacteriological culture test using Petri dishes, before and after disinfection of the air in the premises. The results were processed in a microbiological laboratory. Calculations of bactericidal efficacy were carried out. The combination of an electric air filter and an ultraviolet lamp Phillips TUV 15W/G5 T8 showed the best results of airflow disinfection. The operation of the unit does not affect animals, since the concentration of ozone released is more than five times lower than the maximum permissible concentration for animals. Consequently, animals receive dust-free and disinfected air, which leads to a decrease in animal mortality and, possibly, to an increase in their productivity.