14x3 = 131.94sq" filtering area

14x4 = 175.92sq"

The 14x3 has 3/4. (75%) of the surface area of the 14x4

Unless its made out of a different material, or is thicker...I cant see how the 14x4 only flows 5.4 %. more!


907/860 x 100/1 = 105.4%.