What Is Mpr Rating On Furnace Filters
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If you have been shopping for air filters, you'll notice that there are a few dissimilar rating systems out there. Even though they have completely different numbers, they are still air filters and can be compared directly against each other.
In this article, we'll take a look at the differences between two of the about mutual air filter rating systems– MERV and MPR. Nosotros'll brand sense of these two systems and compare them to each other to bear witness you lot what they measure, how they measure information technology, and what their differences are.
Differences between MERV and MPR filter rating systems
The chief differences betwixt the MERV and MPR filter rating systems are as follows:
- The MERV rating arrangement is the industry-standard rating system. It was established by the American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE).
The MPR rating system 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 order to obtain a MERV rating. For instance, a filter with a MERV rating of MERV-xiii must be able to trap at to the lowest degree fifty% of E1, 85% of E2, and 90% of E3 particles.
The MPR rating arrangement is focused on measuring a filter's effectiveness at capturing the tiniest particles – E1 particles. For instance, an MPR 1000 filter is able to filter 41% of E1, 77% of E2, and 88% of E3 particles. All the same, information technology is non clear what 3M'south guidelines are for giving unlike filters a specific MPR rating.
Even though MERV and MPR are different rating systems, some filters that are rated by each of these systems are straight comparable to each other.
For instance, a MERV-thirteen filter is very similar to an MPR 1500 filter in terms of how constructive they are at capturing particles of E1, E2, and E3 sizes.
What is the MERV filter rating organisation?
The Minimum Efficiency Reporting Value, or MERV rating organization is defined in ASHRAE standard 52.two. It is the manufacture-standard air filter rating system.
ASHRAE 52.two defines the performance level that a filter must achieve to obtain a sure MERV rating. ASHRAE 52.2 also defines the testing procedures that are required for a filter to obtain a MERV rating.
The MERV rating calibration defines the minimum percentage of particles that must be trapped by an air filter in order to obtain a particular rating. The MERV rating scale goes from MERV-ane to MERV-16, with MERV-16 providing the best filtration on the MERV scale.
For instance, in order for a filter to obtain a MERV-13 rating, the filter must exist able to capture at least 50% of E1 particles, 85% of E2 particles, and ninety% of E3 particles. See our section below on the differences betwixt E1, E2, and E3 particles.
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The table beneath shows what percentage of particles must exist 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 - 3.0 microns) | E3 particles (three.0 - 10.0 microns) |
| MERV-1 | - | - | <20% |
| MERV-2 | - | - | <20% |
| MERV-3 | - | - | <20% |
| MERV-4 | - | - | <twenty% |
| MERV-5 | - | - | >20% |
| MERV-6 | - | - | >35% |
| MERV-seven | - | - | >50% |
| MERV-8 | - | >20% | >70% |
| MERV-9 | - | >35% | >75% |
| MERV-10 | - | >fifty% | >80% |
| MERV-11 | >20% | >65% | >85% |
| MERV-12 | >35% | >fourscore% | >ninety% |
| MERV-13 | >50% | >85% | >90% |
| MERV-14 | >75% | >90% | >95% |
| MERV-fifteen | >85% | >ninety% | >95% |
| MERV-16 | >95% | >95% | >95% |
How does the MPR filter rating arrangement work?
The MPR, or Microparticle Performance Rating arrangement is designed to measure an air filter'southward filtration of microparticles. Specifically, the organisation focuses on measuring a filter's efficacy for particles in the 0.iii to 1.0 micron range.
These tiny particles of particulate matter are institute in the air. These particles can be inhaled and cause health concerns. Particles less than x 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 bore poses the greatest risk to your health. This type of particulate affair, likewise known every bit PMii.5, is the master cause of haze in the United states of america.
The MPR filter rating organisation is intended to mensurate a filter's effectiveness for particles in the PMii.five range. Since particles in this range are the cause of wellness problems, filtering them out volition meliorate the air quality inside your home and aid prevent health issues that stalk from microparticles.
The MPR rating arrangement is measured on a calibration 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.iii to 1.0 micron range.
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What nearly HEPA filters?
HEPA filters are a unlike beast altogether. HEPA filters are not reflected on the MERV rating calibration because they exceed the testing requirements prepare forth by ASHRAE 52.2.
HEPA filters are tested and certified to filter out at least 99.97% of 0.three micron particles. 0.three micron particles are the smallest particles that are tested by the MERV rating scale.
For comparison, MERV-sixteen filters are rated for only capturing >95% of E1 particles, which include particles between 0.3 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.
Only just because HEPA filters have the all-time filtration, doesn't hateful that you should use them in your dwelling house'due south HVAC system. HEPA filters are typically only used for the absolute most stringent environments– such every bit hospital operating rooms, make clean rooms for computer chip manufacturing, etc.
If you tried to use a HEPA filter in your habitation'due south furnace, the airflow restriction from the filter would probably burn out your blower motor in no time at all. A typical residential HVAC organisation is simply not designed for running with a HEPA filter.
ASHRAE 52.2 testing procedure for air filters
ASHRAE standard 52.ii also defines the methods for testing filter efficiency by particle size. These methods must be used in lodge 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, it passes through the filter, and some of the particles get trapped in the filter.
The air filter'due south operation is determined past counting the particles before and after the filter. Six tests are washed on a single filter– the test is started with a clean filter, then that same filter is used for five boosted tests.
For each of these tests, the filtration efficiency is calculated as the ratio of particles measured later on the filter to particles measured before the filter. Basically, the more than particles that were trapped in the filter, the higher the filter'southward efficiency.
There are twelve unlike size ranges of particles that are tested. Each of these size ranges is put into one of 3 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 3 different size groups to determine their efficiency.
Particle size ranges for E1, E2, and E3 particles
| Particle Size Range | Particle Diameter (microns) | Group |
| ane | 0.xxx to 0.xl | E1 |
| 2 | 0.40 to 0.55 | |
| 3 | 0.55 to 0.lxx | |
| 4 | 0.70 to 1.00 | |
| 5 | 1.00 to 1.30 | E2 |
| 6 | 1.30 to 1.threescore | |
| vii | 1.60 to 2.twenty | |
| 8 | 2.20 to 3.00 | |
| nine | 3.00 to 4.00 | E3 |
| ten | 4.00 to 5.50 | |
| eleven | 5.50 to vii.00 | |
| 12 | seven.00 to 10.00 |
The E1, E2, and E3 particle groups are adamant past ASHRAE standard 52.2. The testing factors for ASHRAE 52.2 were adult to provide filter efficiency data for different particle sizes. The goal of these tests is to give an accurate representation of an air filter's performance at removing particles of unlike sizes.
The diagram below shows a comparing betwixt the sizes of E1, E2, and E3 particles. As well shown is the cantankerous-sectional diameter of a human hair, which is much larger than any 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 leaner, such every bit E. coli.
E1 particles are representative of extremely small particles such as 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 Is Mpr Rating On Furnace Filters,
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