16x25x4 MERV 13 Pleated AC Furnace Air Filters by Glasfloss Industries. 4 Pack. Made in the USA

Exact Size: 15-1/2 x 24-1/2 x 3-3/4 Nominal Size: 16x25x4 Filtration Rating: MERV 13. Comparable to MPR rating 1900 to 2200, or FPR 10 rating. Effectively captures and blocks small particles such as virus carriers, bacteria, allergens, smog, smoke, lint, dust, pet dander, and pollen.