@FinchTH The dirt cheap DIY option is a fan with a fat high-pleat-count filter attached to it with rubber bands. Of course you can manufacture a product but this gets the job done with no duct tape.
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@FinchTH 便宜的 DIY 选项是一个风扇，上面有一个用橡皮筋连接的脂肪高褶数过滤器。当然，您可以制造产品，但无需胶带即可完成工作。
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