Choose MERV 8 if no one in your home has allergies, and MERV 11 if you have pets, kids, moderate allergies, or city air. MERV 8 vs MERV 11 comes down to small particles: MERV 11 adds fine dust, smoke, and smog particles that MERV 8 mostly lets through, with slightly more airflow resistance.
MERV 8 vs MERV 11: what's the difference?
A MERV 11 filter catches a much larger share of small particles than a MERV 8 filter, while both catch most large particles like dust, pollen, and pet dander. MERV (Minimum Efficiency Reporting Value) is a 1–16 score for how well a filter traps particles from 0.3 to 10 microns.
| Factor | MERV 8 | MERV 11 |
|---|---|---|
| Minimum capture, 3–10 microns (EPA chart, 2024) | 70% or more | 85% or more |
| Minimum capture, 1–3 microns (EPA chart, 2024) | 20% or more | 65% or more |
| Minimum capture, 0.3–1 micron (EPA chart, 2024) | No minimum | 20% or more |
| Our filters capture | Up to 90% of common particles | Up to 95% of common particles |
| Common particles | Dust mites, pollen, pet dander, lint, and mold spores | Everything MERV 8 catches, plus fine dust, smoke, and smog particles |
| Airflow resistance | Lower | Slightly higher |
| Cost | Lower | Higher |
| Typical FPR and MPR | FPR 5, MPR 700 | FPR 7, MPR 1000–1200 |
| Best for | Standard homes without allergies | Pets, kids, moderate allergies, and city air |
Which particles does each filter catch?
Both filters catch large particles from 3 to 10 microns, such as dust mites, pollen, pet dander, lint, and mold spores. The EPA's MERV chart, last updated in 2024, requires a MERV 8 filter to capture at least 70% of these particles and a MERV 11 filter at least 85%.
The bigger gap is in smaller particles. The same chart requires a MERV 11 filter to capture at least 65% of particles from 1 to 3 microns, such as fine dust, compared with 20% for MERV 8. MERV 11 is also the first of the two with a minimum for particles from 0.3 to 1 micron, the size range of smoke particles.
Airflow resistance
A MERV 11 filter has denser media, so it adds slightly more resistance to airflow than a MERV 8 filter. Most systems in good condition handle MERV 11 without trouble, but an older or low-powered system may lose some airflow.
Cost
MERV 8 filters cost less, and they're enough for homes without allergies. MERV 11 filters cost more, which pays off when someone in your home needs cleaner air.
FPR and MPR equivalents
A MERV 8 filter is typically about FPR 5 or MPR 700, and a MERV 11 filter about FPR 7 or MPR 1000–1200. FPR is The Home Depot's filter rating and MPR is 3M's rating for Filtrete filters, and our guide to FPR vs MERV ratings explains how they convert.
Is MERV 8 good enough?
Yes, MERV 8 is good enough for most homes without allergies, asthma, or several pets. Our MERV 8 air filters capture up to 90% of common particles and put less strain on your system than higher ratings.
MERV 8 handles the everyday particles most homes deal with:
- Household dust and lint
- Pollen
- Mold spores
- Dust mites
- Pet dander
Step up from MERV 8 if you have several pets, allergies or asthma, or smoke or smog from outside. MERV 8 catches only a small share of the fine particles behind those problems.
Is MERV 11 too high for a home?
No, MERV 11 isn't too high for most homes. Most systems in good condition run fine with a MERV 11 filter, though an older system or one that already struggles with airflow may lose some airflow.
Our MERV 11 air filters capture up to 95% of common particles and add fine dust, smoke, and smog particles. They're a good fit for homes with pets or kids, people with moderate allergies, and homes in cities or near busy roads.
If no one in your home has allergies, you don't have pets, and your outdoor air is clean, MERV 11 is more filter than you need. MERV 8 will do the job at a lower cost.
Should you choose MERV 8 or MERV 11?
Choose the rating that matches the people and pets in your home. Here's how to pick:
- No allergies, no pets: choose MERV 8.
- One or more pets, or young kids: choose MERV 11.
- Moderate allergies, city air, or occasional smoke: choose MERV 11.
- Severe allergies, asthma, or wildfire smoke: consider MERV 13 air filters, if your system can handle the airflow.
- Odors from pets, cooking, or smoking: choose a MERV 8 Carbon air filter. MERV 8 Carbon traps particles at the MERV 8 level and absorbs odors, but doesn't replace MERV 11 or MERV 13 for allergies.
- Tight budget, no air quality concerns: choose MERV 8.
Both ratings come in the same sizes, from common 1-inch sizes like 16x25x1 to thicker sizes like the 16x25x5 air filter.
What does the MERV rating mean?
The MERV rating shows how well an air filter traps particles, on a scale from 1 to 16, and a higher rating catches more small particles. For the full chart and which rating fits other households, see our guide to which MERV rating to use.
How often should you change MERV 8 and MERV 11 filters?
Change a 1-inch MERV 8 or MERV 11 filter every 2–3 months in a typical home, and sooner with pets, allergies, or smoking. A 4-inch filter usually lasts 6–9 months.
For more detail, read how often to change your air filter.
