Weld spatter properties and ways to protect filters from the burning weld splatters were analyzed in the article. It was deter-mined that solidified spatter can be considered as an active agent in environ-ment pollution due to high dispersion, and there is a mass excess comparing with spatter spray. In case of flowing to the ventilation system hot metal drops may cause the fire in case of the contact with the filter material. The series of the experiments don had shown major characteristics of the hot metal drops creation process and time of their selfcooling. The efficiency of hot metal droplets capture and slaking in a uniflow cyclone was determined.