In addition, when processing wood materials such as MDF boards, we deal with formaldehyde used in their production, mostly free formaldehyde in the adhesives and the formaldehyde emission from the finished wood composites, which is carcinogenic to humans and harmful to the environment [12; 13]. Therefore, the critical issue to pay special attention to is the possibility of air cleaning from wood dust. Studies have shown that using a properly operating dedusting installation reduces workers' exposure to wood dust by almost eleven times compared to when dedusting is not used [14]. This will contribute directly to reducing the harmful effects of dust on the human body and the risk of fire or explosion. This risk occurs for various concentrations and sizes of airborne dust particles, but according to research [15], the most dangerous concentration is 0.73 g\(\cdot\)dm\({}^{3}\) for particles in the size range of 25 to 45 \(\upmu\)m. The filtration of wood dust from the air and the benefits for human health and safety are also helpful for the industrial use of dust in the energy industry [16; 17] or in the production of filaments for 3D printing [18; 19]. To do this effectively, it is necessary to understand the phenomena occurring during filtration in industrial conditions and the factors influencing the course of this process. Despite the enormous development of filtration techniques, manifested both in the development of the construction of all kinds of particle-separation devices (cyclones and filters) and in the design and development of filtration nonwovens, many questions regarding the filtration process remain unanswered. The current state of knowledge about the phenomena occurring during filtration and the factors determining it is based on laboratory tests carried out in small-scale devices and limited research possibilities [20]. The limited scale of laboratory equipment and the aging tests of filtering nonwovens according to specific rules [21; 22], aimed at simulating the use process in industrial conditions, are burdened with a certain error resulting from imprecise simulations of real conditions [23]. These studies focused on studying the impact of the type of non-woven fabric used on its effects [20; 24; 25; 26; 27]. In some cases, the influence of the operating time of filtering nonwovens on their functional properties was also investigated [26]. The differences obtained as a result of computational analysis and as a result of laboratory experiments generate the need to investigate the phenomena occurring during dust filtration in real conditions. There are no results describing the filtration process for materials operating in industrial conditions. To investigate the phenomena occurring during filtering air purification from wood dust, one should refer to the actual filtration conditions encountered in furniture factories, where industrial-scale filtration devices are used to separate this type of dust. Only the actual conditions of using the filter materials give the appropriate test samples that will allow for describing the filtration time and the type and amount of the separated dust on the filter effect. Therefore, for this purpose, it is essential to obtain filter bags from wood dust filters used in a furniture factory and to make laboratory samples from them, which, in later tests, will allow for determining the nature of the process of shaping filtration resistance and the efficiency of dust separation during long-term use of filter materials. The results obtained in this way have the highest application value and can be used when selecting the operating parameters of the filtering installations. The work aims to study the influence of the long-term operation time of filter bags on filtration resistance in an industrial filtering installation in a furniture factory and compare them with the previously achieved test results. The test results will allow for a comparative analysis of the work of filter bags made of various nonwovens in the filter in one production line.