How efficient is merv 8?

MERV 8 filters have a 90 percent efficiency on particles from 3 to 10 microns in size. merv 1 to 4: effective for controlling larger particles such as sanding dust, spray paint dust, lint and carpet fibers. Applicable in residences and window air conditioning units. An official website of the United States Government Official websites use.

gov A. gov belongs to an official government organization in the United States. Minimum efficiency report values, or MERV, report the ability of a filter to capture larger particles between 0.3 and 10 microns (µm). Average particle size efficiency in microns All air filters require periodic cleaning and filter replacement to function properly.

Follow the manufacturer's recommendations for maintenance and replacement. MERV stands for Minimum Efficiency Report Value (MERV) and is an industry standard that measures the overall effectiveness of air filters. As the merv rating increases, the finer the filtration becomes. With finer filtration, fewer pollutants are allowed to pass into the air% 26 dust particles through the filter.

The most common airborne contaminants these filters are tested against tend to include pollen, dust mites, mold spores, dust, pet dander, bacteria and tobacco smoke. What is the filtration efficiency? To be classified as a MERV 8 filter by NAFA (National Air Filtration Association), a filter must filter at least 70% of E3 particles (3.0-10.0 µm) and 20% of E2 particles (1.0-3.0 µm). In addition to 70% of E3 particles, it also filters 30% of E2 particles and 1.9% of E1 particles (0.3-1.0 µm). As it is a MERV 8 filter, it is not designed to trap the smallest particles that fall into the E1 category, such as pet dander.

In addition, after performing standard dust tests, Essential was found to have a detention rate of 81.5%. This means that 81.5% of the dust particles introduced into the filter were successfully filtered out of the air. Not surprisingly, the MERV 8 polyethylene pad and the MERV 8 ring panel had very low fine particle removal efficiencies. ASHRAE 52.2 tests on these types of filters show that they have an efficiency of less than 5% on particles of 0.3µm - 1µm in size.

What was surprising was that the MERV 8 mechanical media filter had such a low efficiency on fine particles compared to the MERV 8 electret media filter. It seems that the combination of mechanical and electrostatic properties in electret media has a benefit, even in pleated filters of “medium efficiency”. A MERV 8 air filter is common in homes, commercial buildings, paint booths and industrial workplaces. These filters have a 90% efficiency in trapping particles from 3 to 10 microns in size.

Filters in the 5-8 MERV range can also trap particles with a size of 3.0-10.0 microns, but are more efficient in doing so. A MERV 5 filter will trap up to 34%, MERV 6 will stop between 35 and 49%, MERV 7 will prevent up to 69% and MERV 8 will trap up to 85% of particulates. These filters are slightly more restrictive than MERV 1-4 filters and have the ability to trap mold spores and some pet dander along with dust and pollen. The EPA recommends that most indoor spaces that are not related to health care should have at least one MERV 13, to ensure adequate filtration and clean air.

The difference in efficiency of a MERV 8 filter and a merv 13 filter is significant. A MERV 8 filter is approximately 20% efficient at capturing particles from 1 µm to 3 µm, while a MERV 13 filter is at least 85% efficient at capturing particles in that size range, a difference of 65%. MERV, also known as the “Minimum Efficiency Report Value”, measures which particulates the air filter captures and how effective it is doing so. Efficiency in the ASW 52.1-92 Standard test method, is a measure of the ability of a filter to remove the stained part of atmospheric dust from the test air.

Therefore, even after 90 days, the dirty MERV 8 electret media filter still performs better on sub-micron sized particles than the clean or dirty mechanical media filter. The fear has been that the loss of efficiency in a pleated electret media filter over time would be so substantial that it would not provide the same effectiveness over its useful life. It is essential to remember that the MERV rating of an air filter denotes its lowest possible capacity, that is, the minimum percentage of impurities that it could effectively filter. However, for common household airborne particles, such as pet dander and mold spores, a merv 13 air filter is a great choice for many homeowners.

The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) uses particle size to classify MERV values. It is essentially a widely accepted rating system used for air filters that uses a scale of 1 to 16 to indicate the effectiveness and extent to which the filter can trap contaminants in the air. At the heart of an optimally functioning HVAC system is an oven filter with the right MERV rating for you. .


AnnMarie Noland
AnnMarie Noland

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