## 3 Results and Discussion
Tunnels, cabs, or disinfecting chambers gained popularity because they represent an efficient option for surface disinfection since the disinfecting agent is dispersed by means of a spraying system, and can thus act in large and complex areas in a short amount of time [19]. Thus, its application was directed to environments with great circulation of people, such as industries [24], and has gained more attention due to the potential for microorganism transmission, such as SARS-CoV-2. There are some companies in the market that already sell cabs, tunnels, and cameras coupled to an O3 generator for the disinfection of people, clothing, or equipment, and some are already previously installed in public environments (examples are shown in Table 4). Nevertheless, no information is shown regarding the stability of the obtained product, or technical reports that guarantee efficacy for a reduction in general microbial load on different surfaces and over an adequate amount of time after exposure to the biocide agent, therefore, the efficacy of these structures has not been clarified to date, which generates doubts for supervising sanitary agencies regarding the real applicability of these products. In terms of scientific publications, some studies approached the use of disinfection chambers and tunnels not only via O3(g) or O3(aq). [PERSON] et al. [22] developed one that is used for the disinfection of people's body with the application of a disinfection solution and far-ultraviolet C. This aims at reducing viral contamination on clothing, skin, and any other exposed surface. This and other studies are summarized in Table 5.  
These findings, together with the number of documents that address O3-based disinfection technologies, indicate that the use of disinfection chambers or similar structures to carry out disinfection processes against pathogens is promising, especially when it comes to their health application, whether for the disinfection of medical articles or for utensils, protective equipment, and others. However, regarding use as a protection barrier for individuals, no considerable number of studies and patent applications were found that could better substantiate this type of application. Some countries stand out in relation to the choice of applicants for the request for initial protection. Figure 4a shows the relevant countries and regions. According to the generated data in the research base, 4% of the companies seek protection in the four largest markets: the United States, South Korea, Japan, and Canada. This shows a compromised investment of the countries and a wider market for these inventions. In general, 10% of the companies are entering orders in more than four countries. A global archiving strategy can demonstrate a greater market potential in this space. In the analysis of potential markets for deposit of this type of technology (Figure 4b), it makes sense that the United States and \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Company/Institution** & **Product** & **Country of Origin** & **Reference** \\ \hline Genial Medical & Disinfection Tunnel Anti-COVID-19 & China & [82] \\ Broad Group Ltd. & BROAD Disinfection Cabin & China & [83] \\ myOzone & Ozone Mist Disinfectant Tunnel & Brazil & [84] \\ Federal Technological University & Wet ozone disinfection booth & Brazil & [85] \\ of Parana & Tropical Clean-Individual & Brazil & [86] \\ Tropical Clean & Disinfection System & Brazil & [87] \\ Eurobras & Ozonized Disinfection Chamber & Brazil & [87] \\ B3 Zonio & Individual Body Disinfection Cabin & Brazil & [88] \\ OZ-AIR\({}^{\circledR}\) & O3-based sterilization tunnel & India & [89] \\ SafeWay & Disinfection cabin & United States & [90] \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Companies and institutions that produce cabins, chambers, and disinfection tunnels coupled with O3 generator. South Korea are the main markets for deposit and search of protection after deposit in the countries of origin since they are the most promising markets for the development of this type of technology.