MERV vs MPR vs FPR Filter Ratings
MERV is the ASHRAE industry-standard scale (1–16). MPR (Micro-Particle Performance Rating) is 3M's proprietary scale, and FPR (Filter Performance Rating) is The Home Depot's 1–10 scale. MERV is the most reliable for comparing filters across brands; MPR and FPR can be converted approximately to MERV.
Rating conversion chart
| MERV | MPR | FPR |
|---|---|---|
| 8 | 600 | 5 |
| 11 | 1000–1200 | 7 |
| 13 | 1500–1900 | 10 |
| 13+ | 2200+ | 10 |
Why we use MERV
MERV is an open, independent standard, so a MERV 13 from any reputable manufacturer meets the same minimum efficiency. MPR and FPR are brand/retailer systems designed for consumer shelves. When specifying filters for a building, always work in MERV.
Frequently Asked Questions
What MERV is MPR 1900?
MPR 1900 corresponds to roughly MERV 13. Conversions are approximate because the rating systems measure efficiency slightly differently.
Which rating system is best?
MERV, because it is an independent ASHRAE standard used industry-wide. MPR and FPR are proprietary and best converted to MERV for accurate comparison.
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