FPR on air filters stands for Filter Performance Rating. It is a Home Depot–style rating system that uses a scale of 4 to 10 , with higher numbers meaning better particle capture.

What it means

  • FPR 4–5 : Good, mainly catches larger particles like dust, lint, dust mites, and larger pollen.
  • FPR 6–7 : Better, catches the above plus smaller particles such as bacteria and mold spores.
  • FPR 8–9 : Best, catches even finer particles like smoke, smog, and allergens.
  • FPR 10 : Premium, the highest commonly listed FPR level.

How to read it

A higher FPR usually means finer filtration, but it can also restrict airflow more if the filter is too dense for your HVAC system. That’s why the “best” rating depends on your equipment and your indoor air needs.

Simple rule

For most homes:

  • Lower FPR = basic dust control.
  • Mid FPR = a balanced everyday choice.
  • Higher FPR = better for allergies, smoke, or finer particles.

If you want, I can also give you a quick FPR vs MERV comparison.