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Air Purifiers as White Noise Machines
White noise machines are widely used for sound masking, increasing privacy in offices and helping people sleep. The classic approach is a fan in a box, though in the past ten years people have mostly switched over to electronic ones. But a fan is really a great approach; you just need to put it to better use: have the fan clean the air. Instead of spinning a fan in free air to make noise, you ca
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