Youmi Space Virus Shut Out Sterilization Card Price in Bangladesh. Purify sound air, breaking the traditional disinfection concept, purify the user's air with a radius of 1m anytime anywhere, breakdown of bacteria/viruses at source, chlorine-containing disinfectant, portable sustained-release chlorine dioxide, safe to use by adult/children / elderly, use time 45 days after unsealing, shelf life 3 years, 60 x 85 mm dimensions, 35 g weight. Many people doubt the safety of chlorine dioxide. The United Nations Health Organization (WHO), however, has long listed it as an A1 class disinfectant. What is a A1 class disinfectant, that is, as safe as sugar and salt, means that it is safe even if eaten.