Abstract: The exemplary system/apparatus can include an electrostatic precipitation apparatus for room ventilation, which can have a two-stage charging type electrostatic precipitator including an ionization section, a particle collection section and a power supply. The exemplary apparatus can include a constant-current control unit/arrangement interposed between the power supply and the ionization section. A sensing unit/arrangement can be interposed between the power supply and the particle collection section. A voltage step control unit/arrangement can receive the applied voltage value and current value from the sensing unit/arrangement for issuing a command to increase or decrease the predetermined voltage to prevent the particle collection section from anomalously discharging in response to an anomalous discharge.

Abstract: A tornado generating method and apparatus in accordance with the present invention can generate a tornado without forming an enclosed space and forcedly generating a spiral flow therein, and an object of the present invention is to ensure a wide collection range with vortex convergency of the tornado. In particular, a fluid flow in a fixed direction is brought into contact with a discontinuous fluid flow flowing in the reverse direction, remaining in a static state and flowing with a different rate relative to said fluid flow, or an object, to form a discontinuous plane therebetween. By sucking a fluid from at least one end of the axial direction of a plurality of vortexes generated on the discontinuous plane, the plurality of vortexes can be converged to form a core of a tornado in a free space, thereby artificially generating a tornado toward the sucking direction and a wide range of collection is ensured by the vortex convergency of the tornado.

Abstract: A body furniture is provided having one or more air exhaust ports and a built-in air fan. A top plate having one or more air suction port is positioned on the furniture body, and a tornado-based suction unit is removably placed on the one or more of the air suction ports. The tornado-based suction unit includes a cylinder having a window formed through a peripheral wall thereof, and a suction hole formed through at least one of end surfaces of the cylinder connected to a suction side of the air fan. An artificial tornado is generated within the cylinder and collects contaminated air such as the smoke of cigarettes. The collected contaminated air is cleaned. Minus ions or fragrance may be supplied to air sucked from the suction hole to fill a space around the body.

Abstract: An air cleaning system having a forced negative pressure generating function is provided for defining a space in a room for utilizing the space as a smoking area or the like in which contaminated air such as smoke is prevented from flowing out of the space and is cleaned. The air cleaning system having a forced negative pressure generating function has an air curtain producing unit having a blow-out port for producing air curtains to surround a predetermined space, an air sucking unit having a suction port open to the predetermined space defined by the air curtains for sucking air in the predetermined space, an air exhausting unit having an exhaust port open to the outside of the predetermined space for exhausting air sucked by the air sucking means to the outside of the predetermined space, an air cleaner unit interposed between the exhaust port and the suction port, and an air cleaner body supported by a plurality of stems for accommodating the components.