Product review (2 stars): At only 2/3 the thickness of Vornado filters, it's ...
At only 2/3 the thickness of Vornado filters, it's humidification capacity, as a result, is less than the Vornado filters.  Sure, it "fits" the length and width, for what that's worth. These filters are rather disappointing, considering the price is only a little bit less than the factory filters.  Perhaps the aluminum layer will keep these thin filters from folding in half when they get wet.  Since I've just put the first pair into service, I'll have to wait a bit to find out.

[followup - 11/28/17]
I'm getting less that 3 weeks before they calcify and don't humidify at all.  Way too thin to be worth this much money.  I'll be buying another brand when my original 6-pack runs out in a couple of weeks.  I'm not sure what purpose the aluminum layer is supposed to serve, but it turns out to be just another part of the filter that doesn't absorb water.