## 2 Materials and Methods
### Data Collection (Questionnaire Development and Application)  
The study data were obtained through the application of a paper questionnaire with qualitative questions, in addition to acquiring additional information regarding the profession and the hospital or healthcare unit (Table S1). The participants answered the survey questions in pen to respect the security and inviolability of the data. After filling out the document, they were stored according to the ethical recommendations. The questionnaire was divided into two main categories: history of contact with the biocidal agent (sodium hypochlorite), and the perception related to the use of the disinfection chamber. The main objective of the questions was to assess the clinical safety and satisfaction/acceptability of the technology for use during the COVID-19 pandemic, as per the participating professionals. Therefore, the participants were asked the following questions:  
1. What is your occupation?
2. Do you use sodium hypochlorite to clean/disinfect surfaces in your home?
3. If the answer to the previous question was yes, do you take any precautions when handling sodium hypochlorite?
4. Have you experienced any type of prior adverse reaction to sodium hypochlorite in previous contact? If yes, please indicate the type(s) of reaction(s).
5. Do you consider that sodium hypochlorite is a good disinfect?
6. Did you know that sodium hypochlorite (0.1% to 0.5%) is effective for the inactivation of the new coronavirus (SARS-CoV-2), and is recommended by the World Health Organization (WHO) for the disinfection of home and hospital environments?
7. Did you know that a sodium hypochlorite solution is used in the chamber for the instantaneous disinfection of Personal Protective Equipment (PPE)?
8. Did you experience any discomfort when using the disinfection chamber? If yes, please indicate the discomfort(s) you felt and specify the degree of irritation.
9. Did you know that the chamber was developed to reduce the microbial load, including that of SARS-CoV-2, on the surface of PPE?
10. Do you consider the use of the disinfection chamber before the PPE doffing process to be a safe alternative? If you answered NO to the previous question, why do you not find it to be a safe alternative?
11. Did you check that all of the PPE was uniformly humidified after using the chamber?
12. Do you consider the disinfection chamber to be effective as an additional protective barrier for healthcare workers?
13. Do you consider that the use of the disinfection chamber can lead to a false sense of safety? If you answered YES to the previous question, why do you think using the disinfection chamber leads to a false sense of security?
14. Did you know that even with the use of the chamber, all PPE doffing procedures and protocols must be followed strictly?
15. After using the chamber, have you followed all the appropriate procedures for the doffing of the PPE?16. Do you have any remarks or comments you want to add about the chamber?  
The answer options for questions 2, 4, 6, 7-9 and 14 were binary (Yes or No), while for questions 5, 10-13 and 15 the options were: Yes, No or Don't Know. The questionnaire was administered to qualified professionals from nurse staff in an area of the hospital or healthcare unit that was specifically designated for this purpose.