作为白噪声机的空气净化器

与其在自由空气中旋转风扇制造噪音，不如让它通过过滤器拉动空气。 一个小的净化器听起来很像经典的噪声机，只有稍微大一点，更昂贵，能从空气中清除烟雾和感染性粒子。 举例来说，这里有一个直径6.5"的47个净化器，在45dB时，每分钟清洁34立方英尺的空气("CADR"). 在大多数人使用白噪声机的情况下，这种小的净化器会更好。

现在，34 CFM 不是很多空气清洁。 通常我运行一个Air Fanta 3Pro，它能清理~6x多的空气，以同样数量的噪音，或者~12x多的空气和更多噪音(~56dB). 另一方面，它更昂贵(165美元)，更粗壮(12.6美元)，而且可能更丑。

不过，即使是34个CFM净化器也能用烟雾帮很多忙。 如果有一个10英尺的平方房间，天花板8英尺，并且通过室外的渗漏而合理典型的每小时0.5个空气变化，这个小型的净化器将把颗粒量削减到室外水平的16%. 在AQI(不是线性)术语中，这就像从AQI 200到72，或者从AQI 100到31.

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Instead of spinning a fan in free air to make noise, you can have it pull air through a filter. A small purifier sounds a lot like a classic noise machine, is only a bit larger and more expensive, and removes smoke and infectious particles from the air. For example, here's a $47 purifier with a 6.5" diameter, cleaning 34 cubic feet of air per minute ("CADR") at 45dB. For most circumstances where someone would use a white noise machine, this kind of small purifier is all-around better.

Now, 34 CFM is not very much air cleaning. I usually run an AirFanta 3Pro and it cleans ~6x more air for the same amount of noise, or ~12x more air with much more noise (~56dB). On the other hand it's more 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 10ft square room with an 8ft ceiling and a reasonably typical 0.5 air changes per hour through leakage from outdoors, this small purifier will cut particulate levels to 16% of the outdoor level. In AQI terms (not linear) this is like going from AQI 200 to 72 or AQI 100 to 31.

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