Photograph: Kat Merck
I was not able to discern any difference between the two models, either physically or in performance. I started out using the original Shelfy but immediately switched to testing the Shelfy 2 when it arrived. Since most testing was conducted with the 2, all references to “Shelfy” henceforth refer to that device.
As for how the photocatalysis works, a fan draws air into the device, where it is forced between the treated ceramic filter and 12 blue LED lights and “cleansed” by a…


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