What Does Mpr Stand For In Air Filters
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If you accept been shopping for air filters, y'all'll notice that at that place are a few unlike rating systems out there. Even though they have completely unlike numbers, they are still air filters and tin can be compared directly against each other.
In this article, we'll accept a look at the differences between two of the near common air filter rating systems– MERV and MPR. We'll make sense of these two systems and compare them to each other to evidence y'all what they measure out, how they measure it, and what their differences are.
Differences between MERV and MPR filter rating systems
The principal differences between the MERV and MPR filter rating systems are as follows:
- The MERV rating system is the manufacture-standard rating arrangement. It was established by the American Society of Heating, Refrigerating, and Ac Engineers (ASHRAE).
The MPR rating organization was created by 3M to measure an air filter's effectiveness at filtering out microparticles.
- The MERV rating system establishes minimum percentages of particles that a filter must trap in social club to obtain a MERV rating. For instance, a filter with a MERV rating of MERV-thirteen must exist able to trap at least 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 k filter is able to filter 41% of E1, 77% of E2, and 88% of E3 particles. However, it is not clear what 3M'southward guidelines are for giving dissimilar filters a specific MPR rating.
Even though MERV and MPR are unlike rating systems, some filters that are rated by each of these systems are direct comparable to each other.
For example, 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 organization?
The Minimum Efficiency Reporting Value, or MERV rating system is defined in ASHRAE standard 52.2. It is the manufacture-standard air filter rating system.
ASHRAE 52.ii defines the performance level that a filter must accomplish to obtain a sure MERV rating. ASHRAE 52.2 as well 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 lodge to obtain a detail rating. The MERV rating calibration goes from MERV-1 to MERV-16, with MERV-xvi providing the all-time filtration on the MERV calibration.
For instance, in gild for a filter to obtain a MERV-13 rating, the filter must exist able to capture at least l% of E1 particles, 85% of E2 particles, and xc% of E3 particles. Encounter our section below on the differences between E1, E2, and E3 particles.
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The table below shows what percent 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.three - 1.0 microns) | E2 particles (1.0 - 3.0 microns) | E3 particles (3.0 - x.0 microns) |
| MERV-1 | - | - | <xx% |
| MERV-2 | - | - | <20% |
| MERV-3 | - | - | <twenty% |
| MERV-4 | - | - | <20% |
| MERV-5 | - | - | >20% |
| MERV-6 | - | - | >35% |
| MERV-7 | - | - | >50% |
| MERV-8 | - | >20% | >70% |
| MERV-9 | - | >35% | >75% |
| MERV-10 | - | >50% | >80% |
| MERV-11 | >20% | >65% | >85% |
| MERV-12 | >35% | >80% | >xc% |
| MERV-13 | >fifty% | >85% | >90% |
| MERV-14 | >75% | >90% | >95% |
| MERV-fifteen | >85% | >xc% | >95% |
| MERV-sixteen | >95% | >95% | >95% |
How does the MPR filter rating system work?
The MPR, or Microparticle Performance Rating arrangement is designed to measure an air filter's filtration of microparticles. Specifically, the system focuses on measuring a filter's efficacy for particles in the 0.three to ane.0 micron range.
These tiny particles of particulate thing are found in the air. These particles tin be inhaled and crusade health concerns. Particles less than ten micrometers are able to get into your lungs. Some of them are even able to get into your bloodstream.
Particulate thing that is less than 2.5 micrometers in diameter poses the greatest risk to your health. This type of particulate affair, too known every bit PM2.5, is the principal crusade of brume in the U.s..
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 wellness problems, filtering them out will ameliorate the air quality inside your home and help preclude health issues that stalk from microparticles.
The MPR rating system is measured on a calibration from MPR 300 to MPR 2800. The college the MPR number, the greater the filter's effectiveness at removing tiny airborne particles.
For instance, 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 most HEPA filters?
HEPA filters are a dissimilar animal altogether. HEPA filters are not reflected on the MERV rating scale because they exceed the testing requirements fix forth by ASHRAE 52.2.
HEPA filters are tested and certified to filter out at least 99.97% of 0.3 micron particles. 0.3 micron particles are the smallest particles that are tested by the MERV rating scale.
For comparison, MERV-16 filters are rated for only capturing >95% of E1 particles, which include particles betwixt 0.iii and i.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 considering HEPA filters accept the best filtration, doesn't hateful that yous should use them in your home'southward HVAC system. HEPA filters are typically just used for the absolute virtually stringent environments– such equally infirmary operating rooms, clean rooms for computer fleck manufacturing, etc.
If you tried to use a HEPA filter in your home'southward furnace, the airflow restriction from the filter would probably burn out your blower motor in no fourth dimension at all. A typical residential HVAC organization is simply not designed for running with a HEPA filter.
ASHRAE 52.2 testing procedure for air filters
ASHRAE standard 52.2 as well defines the methods for testing filter efficiency by particle size. These methods must exist used in lodge for a filter to obtain a valid MERV rating.
To exam a filter, an aerosol generator is used to spray particles of known sizes into an air stream. Every bit the air flows through a test duct, it passes through the filter, and some of the particles become trapped in the filter.
The air filter'south functioning is determined by counting the particles before and afterward the filter. Six tests are done on a single filter– the test is started with a clean filter, 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'due south efficiency.
There are twelve dissimilar size ranges of particles that are tested. Each of these size ranges is put into 1 of 3 different groups: E1, E2, and E3. Calculating the boilerplate 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 charge per unit of air filters is tested using these 3 different size groups to determine their efficiency.
Particle size ranges for E1, E2, and E3 particles
| Particle Size Range | Particle Diameter (microns) | Group |
| i | 0.xxx to 0.40 | E1 |
| 2 | 0.40 to 0.55 | |
| 3 | 0.55 to 0.70 | |
| 4 | 0.lxx to ane.00 | |
| five | ane.00 to 1.xxx | E2 |
| 6 | i.30 to one.60 | |
| 7 | one.lx to two.xx | |
| 8 | 2.20 to 3.00 | |
| ix | 3.00 to 4.00 | E3 |
| 10 | 4.00 to 5.50 | |
| eleven | five.50 to seven.00 | |
| 12 | 7.00 to 10.00 |
The E1, E2, and E3 particle groups are adamant by ASHRAE standard 52.2. The testing factors for ASHRAE 52.2 were developed to provide filter efficiency information for dissimilar particle sizes. The goal of these tests is to give an accurate representation of an air filter'southward performance at removing particles of different sizes.
The diagram below shows a comparison between the sizes of E1, E2, and E3 particles. Also shown is the cross-sectional diameter of a man pilus, which is much larger than whatever of those particles.
PM10 particles are typical particles in the E3 range. The size of these particles is typical of grit, 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 as E. coli.
E1 particles are representative of extremely minor particles such as smoke, brume, 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 Stand For In Air Filters,
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