16x20x4 merv 13 (mpr 2200) ac furnace 4" inch air filters. 6 pack (actual depth: 3-3/4") actual size: 15-1/2 x 19-1/2 x 3-3/4 | nominal size: 16x20x4 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.
