Abstract
Ice rain is precipitation consisting of small and solid frozen droplets-spheres of small diameter. Currently, this weather phenomenon is permanent in the territory of Central Russia and can be repeated 3-4 times during the winter season. Ice rains cause significant damage to green spaces and urban infrastructure, have an adverse effect on the performance of engineering equipment of buildings. The article presents the results of a field study of the functioning of an emergency ventilation system equipped with a flare system for harmful substances in conditions of ice crust formation. The factors that cause wear and decrease in the efficiency of engineering systems in conditions of ice rain are listed. After several cycles of freezing and thawing, the exhaust system remains operational without extraneous noise and vibrations, the exhaust devices operate normally, there is no imbalance of the fan impeller. The icing of the protective cover of the electric motor does not affect the bearings, winding, terminal box, impeller and other elements of the electric motor. For ventilation installations located in harsh climatic conditions, a reinforced protective cover design with a louvered grille is recommended. In case of extreme weather conditions, accompanied by severe icy-frost deposition (over 0.8 cm), it is recommended to exclude technological processes accompanied by salvo emissions of harmful substances.