Product review (3 stars): Not for use in the SPT Humidifier
This isn't the correct filter for the SPT humidifier that it was linked to. It is taller than the SPT filter and consists of two halves, while the SPT filter is considerably shorter and the two halves are connected to form a cylinder. I have trimmed the Vornado filters to fit into the SPT humidifier, but they don't work as well as the original SPT filters.