根据我对空气净化器原理的了解,要减少颗粒物污染的关键在于HEPA 滤网。虽然我只在中国住一年,我真不舍得花8000民币买一台超贵的净化器,我觉得我可以自己制作属于自己的空气净化器。
我在这里给出净化器有效的数据(1, 2, 3, 4),这篇是教你如何制作DIY空气净化器。
#1 购买一台风扇
非常重要的一点,风扇的前面最好有一个平面,这样可以方便把HEPA网绑上去。这是我花58元购买的风扇。

#2 购买HEPA滤网
这是我购买的第一个HEPA 滤网,价格108元人民币。

我测试所有我能找到生厂商的HEPA网,希望可以找到一个既能捕捉更多颗粒,同时风阻更小-也就是可以通过更多空气的HEPA。我用激光测试仪做了测试,结果表明这款HEPA 的效果非常好。因为我一次性批量采购,所以这 个HEPA 比我初次买的HEPA 要便宜,放在我的淘宝店(还有Smart Air 官网)供有需要的人购买。
#3 卸掉风扇前面突出的部分
把风扇的前网拆掉,前网是通过一个卡片固定的,如果有钳子会更容易操作。
把风速开关调到高档,然后把开关旋钮卸下。旋钮突出会使HEPA不能很好和风扇贴和。没了旋钮,可以通过插拔插头来开关风扇。

#4 用绑带将HEPA 滤网系上,你就成功制作了你自己的DIY空气净化器了!
用固定带把HEPA绑在风扇的前面,专属于你的空气净化器就完成了!
风扇中间的铁棍可能会稍微插入滤网。我的测试结果表面这个问题并不会影响HEPA 的效率,为了安全你也可以把它锯掉。当然,要是能够找到没有铁棍的风扇是最好,也是我正在销售的(淘宝网)。

这DIY净化器价值166人民币(27美元)。你的下一个问题一定是:DIY空气净化器和那些昂贵的8000人民币的空气净化器比较,效果如何呢?点击这里观看测试视频,用更给力的风扇效果会更好吗,和其他品牌比较起来效果如何。
你也可能会想:滤网不是应该在风扇的背面吗?其实,我的直觉一直是‘放前后并不会有差别’,但测试的结果竟出乎我预料。
- 购买一台风扇;
- 购买HEPA滤网;
- 拆掉风扇前网;
- 将HEPA滤网固定在风扇前侧。


Thanks for sharing. Does this work for filtering out the Covid-19 virus particles in air aerosols? If I use such a purifier while I stay in a hotel room where the windows cannot be opened, is it going to be effective?
A humidifier’s main purpose is to restore moisture to the air in your house. It achieves this by injecting water vapour into a room, which can be visible or not. Continue to fill a reservoir with water to keep the humidifier operating. The mechanism converts the water into a fine mist and expels it into the surrounding air. v Humidifiers are most effective in dry environments because they replace moisture in the air. The Most Effective Air Purifier Living in an arid area can cause dry skin, throat irritation, sinus problems, nosebleeds, and breathing difficulty. A humidifier can assist.
Is there any reason why your filters are relatively very thick compared to other air purifiers? I definitely like that your filters are thick – it feels robust. But I noticed that other HEPA filters are usually thin and made of less paper. Does it mean that your filters are much more robust & has better longevity or is it a simple trade off in cost-effectiveness (i.e. cheaper material but equal effectiveness)?
Seeing as we can’t search through comments, I apologize if this has been asked:
How much difference does it make if we don’t pull the grating and knobs off, or if the filter is not the same size or cannot be fastened flush with the fan?
It seems odd to me that filters will be the same dimensions as fans as they come in all different shapes and sizes!
Can I use air cooler without water instead of standard fan for the diy cooler?