Purpose - to determine maximum dust holding capacity with the set dust-catching efficiency of two successively adjusted filtering elements made of polypropylene material when being dusted with coal dust. To define resistance of filters and their dust holding capacity, a gravimetric method was used according to DSTU EN 143-2002 requirements. The calculation methods consist of two stages. At the first stage the diameter of pre-filter fibres is calculated on the basis of maximum dust holding capacity for the set ultimate pressure and dust particle target size. At the same time, thickness and density of fibre packing of a filtering layer are selected by reference to conditions of the technological process of its formation while producing filtration fabric. At the second stage the radius of the main filter based on the set dust-catching efficiency is calculated. It has been established that dust deposit on polypropylene filtering elements of respirators occurs in the front layer. It has been defined that dust holding capacity and protective power time of respirators can be increased while filtering coal dust with a system of two successively adjusted filtering elements with the following parameters: packing density of 55 and 27 g/cm<^>2; a fibre radius of 2 - 4 and 6 - 10 microns and a thickness of a filtering layer of 4 and 3 mm, respectively. This allowed creating an anti-aerosol two-layer polypropylene filter RPA-TD 1.2 which meets the DSTU EN 143-2002 requirements and can be used for protecting people's respiratory organs at the site of intensive coal dusting including stoping face, coal transloading, dressing plants and others. Dust holding capacity of filters depends on generation of self-filtering dust layer, which can develop on the work surface at speeds below 0,04 m/s. Rational parameters of the two successively adjusted filtering elements of polypropylene fabrics were defined with the protective power time of the proposed system increased by 25 % compared to the used filtering elements for RPA respirators.

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