DIY Air Filter Beats Amazon's Best Seller!
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I built a high-grade air purifier for around $35. Way less than Amazon’s best-selling $60 filter. In this video I’ll show you how I built it and how well it ...
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The original was posted on /r/crboxes by /u/DaGermanBear on 2025-08-25 18:06:19+00:00.

Merv 5 as a pre-filter and then Merv 13 underneath it. I’m super open to any feedback you guys have for improvements of the design or my editing style