Which of the following substances is commonly used for disinfecting rooms?

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Phenol at a concentration of 20%High-efficiency particulate air (HEPA) filtersFormaldehyde vapor at 40% concentrationGaseous chlorine

Explanation

Among the listed options, 40% formaldehyde vapor is widely utilized for room disinfection due to its effective antimicrobial properties. Phenol at 20% is less commonly used for this purpose, HEPA filters are for air filtration rather than disinfection, and chlorine gas is not typically used for disinfecting rooms.