I never thought I'd be pulled in by a product that essentially bills itself as "Clean your air CHEAP with this one cool trick discovered by a college kid", but they've executed well.

What they're offering is just an easy way to buy a fan and HEPA filter ($27USD, or 166RMB, as the FAQ freely admits). Even so, their website makes me like instantly their business model, and because of their approach and willingness to run workshops, I immediately trust goods from them more than than I trust buying the parts directly from the manufacturer.

It will be interesting to see what they do with their new, loyal customer base. I imagine they could easily start a filter-replacement subscription service, where they send you as many new filters as you need for XXrmb/year. If you're needing more than is profitable, they could add a phone call into the process "to diagnose why your home is needing filters than it should". This is the kind of honor system that only works if your customers already like you. Assuming their product actually works, I think they will easily achieve that.