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Protective efficiency of filtering dust respirators depends on the properties of filter materials from which filters are made and the structure of a half mask frame, which influences how tightly the respirator fits the face. The conducted studies on the “Lepestok 40” dust respirator revealed a large air leakage through the gaps occurring along the obturation strip. Therefore, the purpose of the study is to develop a dust respirator to provide high level of protection and usability by improving the half mask frame design. A scheme for designing a dust respirator: analysis of operating conditions for the dust respirator; facial anthropometric measurements of potential users; designing a 3D model of half mask frame; laboratory testing of the protective properties of the product. A distinctive feature of this approach is considering the facial anthropometric dimensions of employees of a particular enterprise, standard sizes formation of 3D facial models, which is the basis for designing a half mask frame for dust respirator. A new half mask frame design for dust respirator with a variable geometry of fitting to the face surface has been developed, due to special attachment points that allow changing its size according to the anthropometric dimensions of user’s face.

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The influence of errors and inconsistencies on the protective effectiveness of filter respirators during the process of their selection and operation, which is due to the need to assess occupational risks in the selection of filter respirators. The method of functional resonance analysis of the study was used to model the development of different scenarios through the description of the functions of the process of selection and operation of respiratory protection, which will lead to deterioration of workers' protection based on the time of operation, availability of necessary resources and appropriate level of control. The main functions in the selection and operation of personal respiratory protection, which depend on the analysis of working conditions, justification for the choice of personal respiratory protection, checking the adequacy and features of the operation of filter respirators based on input data, operating time of possible prerequisites, required resources and appropriate level control. To describe the variability of functions, it is proposed to consider four scenarios based on their timely and accurate implementation, which allowed to present possible errors in the selection and operation of filter respirators and their consequences for effective protection of the worker given the development of several possible positive and negative results. implementation. Recommendations have been developed to reduce errors in the selection and operation of filter respirators, which is extremely important and necessary to maintain the appropriate level of protection of users throughout the specified period of operation by strengthening control over their protective properties at each stage of use.

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