PURPOSE: To provide a method to enable dusts and various germs to be removed in a room to purify its space by floating and recycling in the room a sterilizing liquid which is mixed and atomized at the tip of a jet nozzle to catch and sterilize dusts and various germs by means of a fan and removing the atomized sterilizing liquid with the dusts and various germs by means of a filter.

CONSTITUTION: The compressed air from a compressor C flows into a jet head J through an air conveying duct 3, so that at the tip of a nozzle 2 vacuum develops and this vacuum draws in a sterilizing liquid d in a storage tank T into the nozzle 2 through a liquid conveying tube 1, and the liquid is there atomized and diffused and injected into the inside of the room R to sterilize the wall faces and various appliances. The air pressurized by a fan 5 and flowing towards the jet head J side circulates in the room R and flows again to the side of the fan 5. Dusts and germs floating and contained in the pressurized air attach to a filter 6 to be removed on it from the liquid, so that the room air is purified. Further from the sterilizing liquid d recovered to the storage tank T dusts and various germs are removed through a filter f and the sterilizing liquid that has passed through the filter f is again sent to the side of the liquid conveying pipe 1 and used again for room purification.