Exact Size: 15-1/2 x 24-1/2 x 3-3/4 Nominal Size: 16x25x4 Filtration Rating: MERV 10. Comparable to MPR rating 600 to 800, or FPR rating 5 to 6. Effectively shields from small-particles such as smog, smoke, lint, dust, pet dander and pollen. Air Flow is comparable to a MERV 8 with improved filtration. Made in the USA. Ideal for residential and commercial use. Note: Does not replace 5' inch or 4-3/8' Depth filters. Please check actual filter size needed.