It equates FPR 10 to MERV 13, FPR 9 to MERV 12, FPR 7 to MERV 10, and FPR 5 to MERV 8. How to choose a filter by its MERV rating. Michael Hession/NYT Wirecutter.

Aprilaire Healthy Home 213 MERV 13 The 4-inch-thick Aprilaire Healthy Home 213 MERV 13 is excellent at removing dust, smoke, and pollen when the HVAC system is running at its highest fan speed.