What Does Mpr Mean For Air Filters
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If you have been shopping for air filters, you'll observe that at that place are a few unlike rating systems out there. Even though they have completely different numbers, they are still air filters and tin can exist compared directly against each other.
In this commodity, nosotros'll take a look at the differences between two of the about common air filter rating systems– MERV and MPR. We'll make sense of these two systems and compare them to each other to show you what they measure out, how they measure it, and what their differences are.
Differences between MERV and MPR filter rating systems
The master differences betwixt the MERV and MPR filter rating systems are as follows:
- The MERV rating system is the industry-standard rating system. Information technology was established by the American Club of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE).
The MPR rating system was created by 3M to mensurate an air filter's effectiveness at filtering out microparticles.
- The MERV rating system establishes minimum percentages of particles that a filter must trap in order to obtain a MERV rating. For instance, a filter with a MERV rating of MERV-thirteen must exist able to trap at to the lowest degree 50% of E1, 85% of E2, and 90% of E3 particles.
The MPR rating system is focused on measuring a filter's effectiveness at capturing the tiniest particles – E1 particles. For example, an MPR thousand filter is able to filter 41% of E1, 77% of E2, and 88% of E3 particles. However, it is not clear what 3M's guidelines are for giving different filters a specific MPR rating.
Fifty-fifty though MERV and MPR are dissimilar rating systems, some filters that are rated by each of these systems are directly comparable to each other.
For instance, a MERV-13 filter is very similar to an MPR 1500 filter in terms of how effective they are at capturing particles of E1, E2, and E3 sizes.
What is the MERV filter rating system?
The Minimum Efficiency Reporting Value, or MERV rating system is defined in ASHRAE standard 52.ii. It is the industry-standard air filter rating system.
ASHRAE 52.ii defines the performance level that a filter must reach to obtain a certain MERV rating. ASHRAE 52.ii also defines the testing procedures that are required for a filter to obtain a MERV rating.
The MERV rating scale defines the minimum percentage of particles that must be trapped by an air filter in social club to obtain a detail rating. The MERV rating scale goes from MERV-ane to MERV-16, with MERV-sixteen providing the best filtration on the MERV scale.
For case, in guild for a filter to obtain a MERV-thirteen rating, the filter must be able to capture at to the lowest degree 50% of E1 particles, 85% of E2 particles, and xc% of E3 particles. See our department below on the differences between E1, E2, and E3 particles.
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The table beneath shows what pct of particles must be trapped in order to obtain each MERV rating.
MERV Rating Table
| Minimum % of particles removed by air filter | |||
| MERV Rating | E1 particles (0.3 - 1.0 microns) | E2 particles (1.0 - three.0 microns) | E3 particles (iii.0 - 10.0 microns) |
| MERV-one | - | - | <20% |
| MERV-2 | - | - | <twenty% |
| MERV-three | - | - | <twenty% |
| MERV-iv | - | - | <xx% |
| MERV-5 | - | - | >20% |
| MERV-6 | - | - | >35% |
| MERV-7 | - | - | >50% |
| MERV-8 | - | >20% | >70% |
| MERV-9 | - | >35% | >75% |
| MERV-10 | - | >50% | >80% |
| MERV-11 | >twenty% | >65% | >85% |
| MERV-12 | >35% | >80% | >90% |
| MERV-13 | >50% | >85% | >90% |
| MERV-14 | >75% | >90% | >95% |
| MERV-15 | >85% | >xc% | >95% |
| MERV-16 | >95% | >95% | >95% |
How does the MPR filter rating organisation piece of work?
The MPR, or Microparticle Performance Rating system is designed to measure an air filter's filtration of microparticles. Specifically, the system focuses on measuring a filter'southward efficacy for particles in the 0.three to i.0 micron range.
These tiny particles of particulate matter are institute in the air. These particles tin exist inhaled and crusade health concerns. Particles less than 10 micrometers are able to get into your lungs. Some of them are even able to go into your bloodstream.
Particulate matter that is less than two.5 micrometers in diameter poses the greatest risk to your health. This type of particulate matter, too known as PM2.five, is the primary cause of haze in the The states.
The MPR filter rating system is intended to measure a filter's effectiveness for particles in the PMii.5 range. Since particles in this range are the cause of health bug, filtering them out will amend the air quality within your home and help prevent wellness bug that stem from microparticles.
The MPR rating system is measured on a scale from MPR 300 to MPR 2800. The higher the MPR number, the greater the filter's effectiveness at removing tiny airborne particles.
For example, a filter with a rating of MPR 2200 is able to remove 69% of E1 particles– particles in the 0.3 to 1.0 micron range.
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What about HEPA filters?
HEPA filters are a dissimilar beast altogether. HEPA filters are not reflected on the MERV rating scale considering they exceed the testing requirements set forth by ASHRAE 52.two.
HEPA filters are tested and certified to filter out at least 99.97% of 0.3 micron particles. 0.three micron particles are the smallest particles that are tested past the MERV rating scale.
For comparison, MERV-16 filters are rated for only capturing >95% of E1 particles, which include particles between 0.iii and one.0 microns. HEPA filters are able to filter out 99.97% of the smallest E1 particle on the MERV scale. A truly incredible feat.
But merely because HEPA filters have the all-time filtration, doesn't hateful that you should apply them in your home's HVAC system. HEPA filters are typically merely used for the absolute most stringent environments– such equally hospital operating rooms, clean rooms for computer chip manufacturing, etc.
If yous tried to use a HEPA filter in your home's furnace, the airflow restriction from the filter would probably burn out your blower motor in no time at all. A typical residential HVAC system is just non designed for running with a HEPA filter.
ASHRAE 52.two testing procedure for air filters
ASHRAE standard 52.ii also defines the methods for testing filter efficiency past particle size. These methods must exist used in order for a filter to obtain a valid MERV rating.
To test a filter, an aerosol generator is used to spray particles of known sizes into an air stream. Equally the air flows through a test duct, information technology passes through the filter, and some of the particles get trapped in the filter.
The air filter's operation is determined by counting the particles before and after the filter. Six tests are washed on a unmarried filter– the test is started with a clean filter, and so that same filter is used for five additional tests.
For each of these tests, the filtration efficiency is calculated as the ratio of particles measured after the filter to particles measured before the filter. Basically, the more particles that were trapped in the filter, the higher the filter's efficiency.
There are twelve different size ranges of particles that are tested. Each of these size ranges is put into one of three different groups: E1, E2, and E3. Calculating the average minimum efficiency for each of these three groups determines the average particle size efficiency for that particular group.
E1 vs. E2 vs. E3 particles
E1, E2, and E3 are the three different size groups of particles that are tested with air filters. The particle removal rate of air filters is tested using these three different size groups to determine their efficiency.
Particle size ranges for E1, E2, and E3 particles
| Particle Size Range | Particle Diameter (microns) | Group |
| one | 0.30 to 0.twoscore | E1 |
| 2 | 0.40 to 0.55 | |
| 3 | 0.55 to 0.70 | |
| 4 | 0.seventy to 1.00 | |
| five | one.00 to 1.30 | E2 |
| 6 | ane.30 to 1.threescore | |
| seven | i.threescore to 2.twenty | |
| 8 | 2.20 to iii.00 | |
| nine | 3.00 to 4.00 | E3 |
| x | four.00 to 5.fifty | |
| eleven | 5.50 to 7.00 | |
| 12 | 7.00 to x.00 |
The E1, E2, and E3 particle groups are determined past ASHRAE standard 52.ii. The testing factors for ASHRAE 52.two were developed to provide filter efficiency data for different particle sizes. The goal of these tests is to give an accurate representation of an air filter'southward functioning at removing particles of different sizes.
The diagram beneath shows a comparing between the sizes of E1, E2, and E3 particles. Likewise shown is the cross-sectional diameter of a human pilus, which is much larger than any of those particles.
PMx particles are typical particles in the E3 range. The size of these particles is typical of dust, pollen, and mold spores.
PM2.5 particles consist of mostly E2 and E1 particles. Typical E2 particles are pet dander and some larger bacteria, such equally E. coli.
E1 particles are representative of extremely small particles such equally smoke, haze, bacteria, and some viruses. These are the smallest particles that are measured on the MERV and MPR scales. Particles smaller than 0.3 microns are not measured on either of these scales.
What Does Mpr Mean For Air Filters,
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