Disinfection Sterilization Services Singapore. It is a deodorizing device using photocatalyst. There are HEPA filter built-in type and special deodorant model. It is used in nursing care facilities, kitchens, hospitals, toilets and so on. Airtech is the leading manufacturer of Cleanroom, Bio-Safety and Operating Room equipment’s of high quality and meeting international standards of cleanroom technology, WHO Standard, GMP and Operating Room DIN standard.