Air Purifiers as White Noise Machines
Jeff Kaufman
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Air Purifiers as White Noise Machines
July 29th, 2026
airquality, purifiers
White noise machines are widely used for sound masking, increasing<br>privacy in offices and helping people sleep. The classic<br>approach is a fan in a box, though in the past ten years people<br>have mostly switched over to electronic ones. But a fan is really a<br>great approach; you just need to put it to better use: have the fan<br>clean the air.
Instead of spinning a fan in free air to make noise, you can have it<br>pull air through a filter. A small purifier sounds a lot like a<br>classic noise machine, is only a bit larger and more expensive, and<br>removes smoke and infectious particles from the air. For example, here's<br>a $47 purifier with a 6.5" diameter, cleaning 34 cubic<br>feet of air per minute ("CADR") at 45dB. For most circumstances<br>where someone would use a white noise machine, this kind of small<br>purifier is all-around better.
Now, 34 CFM is not very much air cleaning. I usually run an AirFanta 3Pro<br>and it cleans ~6x more air for the same amount of noise, or ~12x more<br>air with much more noise (~56dB). On the other hand it's more<br>expensive ($165) and bulkier (12.6" square), and arguably uglier.
Still, even a 34 CFM purifier helps a lot with smoke. If you have a<br>10ft square room with an 8ft ceiling and a reasonably typical 0.5 air<br>changes per hour through leakage from outdoors, this small purifier<br>will cut particulate levels to 16% of the outdoor level. In AQI terms<br>(not linear) this is like going from AQI 200 to 72 or AQI 100 to 31.
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Jeff Kaufman
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