MERV stands for Minimum Efficiency Reporting Value, an industry standard that describes the size of particles that can fit through a filter media. Essentially, a filter with a higher MERV rating catches smaller particles. So, the higher the rating, the better the filtration, and the cleaner the air.
The specific MERV ratings for Second Nature (formerly FilterEasy) filters are:
- Catch Some: MERV 8 - blocks particles = 3.0–10.0 μm (1000 MPR, FPR= 7/Red)
- Catch More: MERV 11 - blocks particles = 1.0–3.0 μm (1900 MPR, FPR= 9/Purple)
- Catch All*: MERV 13 - blocks particles = 0.3–1.0 μm (2200 MPR, FPR= 10/Black)
* When we say "Catch All", we mean it collects all the particles you could worry about in an average household while still providing proper air flow. These are not medical grade HEPA filters.
MPR (Micro-Particle Performance Rating) is a standard developed by 3M. It rates the manufacturer’s filters and their ability to capture airborne particles smaller than 1 micron.
FPR (Filter Performance Rating) is a standard developed by The Home Depot for brands sold through their stores, including Honeywell. It utilizes a color and number scale from 4 to 10 that closely resembles MERV rating.
FILTER RATING COMPARISON CHART:
| MERV | MPR | FPR | EFFICIENCY |
| 8 | 1000 | 7/Red | Pollen, sanding dust, textile fibers, carpet fibers, paint overspray, mold, spores, dusting aids, and cement dust |
| 11 | 1900 | 9/ Purple | Everything above, plus large bacteria, pet dander, smaller dust particles, and auto emissions |
| 13 | 2200 | 10/Black | Everything above, bacteria, cooking oil smoke, smog, tobacco smoke, and droplet nuclei (sneeze) |
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