Abstract: A golf practicing device for use by a golfer by mounting it on his head when the golfer trains himself in hitting a golf ball with a golf club, which constantly permits accurate hitting of the ball and thus can serve for improvement of the golfer's golfing skill. The device comprises a body and a vision constricting element having at least two vision constricted view apertures, the golfer being allowed to look at the golf ball only through the vision constricted view apertures via the body. The body abuts a face area around the eyes, and since the sight of the golfer is disrupted at least at both sides, right and left, the golfer is obliged to hit while looking at the ball through the vision constricted view apertures. The view apertures can be adjusted with respect to their position and diameter according to the height, physical constitution, and inter-pupil distance of the golfer.

Abstract: An air cleaner comprising a thin lightweight fan module having at least one fan, at least one casing containing one fan therein and at least one housing containing one casing therein; a thin lightweight air filter module having an air filter; and an air flow moderator disposed between the fan module and the air filter module.

Abstract: An air cleaner comprising a thin lightweight fan module having at least one fan, at least one casing containing one fan therein and at least one housing containing one casing therein; a thin lightweight air filter module having an air filter; and an air flow moderator disposed between the fan module and the air filter module.