The eficency of the electro static precipitator (ESP) depends on many factors such as: gas physical and chemical properties, structure and size of the filter champer, high voltages fed condition, etc. The efficiency of the ESP has been studied and published by many authors, however, those published information is not sufficient enough for use due to many reasons, among that technology confidential is one. The paper describes the study results of the author group about the calculation methodology for filteration chamber parameters of electrostatic precipitators (ESP). The method of calculation was commented and corrected by ESP experts from KONDOR - ECO, a Russian company.