This filter features honeycomb filtration to trap mineral pollutants found in water and help prevent them from entering your home and fits Vornado humidifier models 007, 3120-900, HUI-007, and HUI-0014. It measures approximately 7 3/8 x 9 5/8 x 1 3/4. For optimum performance, replace filter at the beginning of each season or every 2 months depending on use. There are 2 filters per box.