## 4 Conclusions  
Determining the correct operating position of the positive pressure ventilator at which it generates the highest flow rate can have an impact on the effectiveness of Fire Service rescue operations. Verification of the positioning parameters of positive pressure ventilators can be carried out using CFD tools and applying the LES model. As part of this work for the ventilator, a comparative analysis was carried out to assess the degree of convergence of the volumetric flow rate parameter during both a real-scale experiment and a CFD simulation on a dedicated test rig. The analysis performed confirmed the convergence of the incoming flow parameter to the surface of the mock-up doorway installed on the test stand. Under the presented test conditions, the following degrees of convergence were obtained between the experiment and CFD simulation (for variable positioning parameters): 1.9% (1 m), 3.4% (3 m), 1.6% (4 m), 1.6% (5 m), and 3.8% (7 m). The performed analysis confirms the feasibility of using an LES-type model to evaluate the volumetric flow rate under constant pressure conditions--a test configuration corresponding to the actual operating conditions of this type of equipment. An important aspect of the use of LES-type numerical analyses is that, in addition to determining the value of the flow rate, they reproduce relationships that allow practical conclusions to be drawn, such as the optimum distance for ventilator positioning or the geometric distribution of velocity on the control surface, which is often more important to the ventilator user than the value of the pumped flow rate itself. The author team declares to continue the development of work related to the evaluation of the applicability of LES-type analyses in relation to other methods used for testing the flow parameters of positive pressure ventilators (e.g., ANSI/AMCA-240 [29] and ISO 5801 standards [41]). As part of the implementation, in addition to changing the measurement methods, other CFD simulation tools such as Ansys Fluent and OpenFoam will also be used. Conceptualization, P.K., B.Z., L.W. and T.B. ; methodology, P.K., B.Z. and L.W. ; software, P.K., T.P. and T.S. ; validation, P.K., B.Z., L.W. and T.B. ; formal analysis, P.K., B.Z., L.W. and T.B. ; investigation, P.K., P.A. and L.W. ; resources, P.K. and L.W. ; data curation, P.K. and B.Z. ; writing--original draft preparation, P.K., B.Z. and L.W. ; writing--review and editing, P.K., B.Z.,  
Figure 10: Characteristics of the airflow velocity profile of the positive pressure ventilator positioned 7 m from the door opening (measuring plane), where (**a**) real-scale experiment, (**b**) CFD simulation (FDS program), (**c**) difference between the experiment and CFD simulation. L.W. and P.A. ; visualization, P.K. ; supervision, P.K. and B.Z. ; project administration, P.K. ; funding acquisition, P.K. All authors have read and agreed to the published version of the manuscript. The research presented in the article was carried out within the framework of the subsidy of the Ministry of Science and Higher Education, No. 068/BW/CNBOP-PIB/MNiSW. Not applicable. The original contributions presented in this study are included in the article. Further inquiries can be directed to the corresponding author. The authors declare no conflicts of interest.