What is MPR or Microparticle Performance Rating?
3M describes Microparticle Performance Rating (MPR) as "The 3M MPR (Microparticle Performance Rating) focuses on a
filter's ability to capture smaller particles between 0.3 and 1 micron in size.
Based on independent laboratory tests, 3M’s MPR measures a filter’s ability to
capture submicron particles that make up 99% of the particles in the air, such
as bacteria, smoke and smog. The MPR can be used to compare filters, however MPR
cannot predict how a filter will actually perform in your home. The independent
laboratory tests overstate the effectiveness of electrostatic filters, but still
indicate that Filtrete filters with electrostatically charged fibers outperform
all other non-electrostatic filters in their respective categories."
Other important things to know about what your 3M filters will capture and how. Straight from 3M.
include smoke, smog, bacteria, household dust, pet dander, mold spores, dust
mite debris and pollen. These particles range in size between 0.3 to 100
microns. Considering that the average diameter of a human hair is 50 microns,
these particles are so small that most pass right through ordinary furnace
filters right back into the air in your home.
allergen (or allergens)
An allergen is a
substance that's capable of producing an allergic reaction in people who are
sensitive to allergens. In some people with asthma, allergens that are breathed
in can trigger symptoms such as coughing, wheezing, and shortness of breath.
Allergens that may cause asthma symptoms include animal dander, dust mites,
mold, and pollen.
Allergies are an abnormally high
sensitivity to certain substances, such as pollens, foods, or microorganisms.
Common indications of allergy may include sneezing, itching, and skin rashes.
Doctors typically diagnose allergies.
Asthma is a chronic, inflammatory
lung disease characterized by recurrent breathing problems which can be
triggered by allergens. (Infection, exercise, cold air, and other factors can
also be triggers.)
Bacteria are living organisms,
microscopic in size, which usually consist of a single cell. Most bacteria use
organic matter for their food and produce waste products as a result of their
life process. Bacteria are everywhere. They are on everything we see and touch,
and even in the air we breathe.
Chemical Emissions are
the release or discharge of a chemical substance into the environment. The term
generally refers to the release of gases or particulates into the air.
CO carbon monoxide
Carbon Monoxide is a
highly toxic gas that is colorless, odorless and tasteless. It is created by the
incomplete burning of natural gas or any other material containing carbon,
including gasoline, kerosene oil, propane, coal and wood.
are byproducts of the combustion or burning process. Burning fuels such as coal,
oil, gas, and wood produces many pollutants, such as sulfur dioxide, nitrogen
oxides, and particulates. Combustion also produces airborne emissions and solid
waste such as ash and sludge.
Household dust is made up
of a wide variety of things including dead skin from humans and pets, finely
ground plant and insect parts, minute particles of sand and soil, fabric fibers
from clothes, carpets, and upholstery. Dust typically accumulates in carpets, on
horizontal surfaces, computer and TV screens, and sometimes clumps into dirty
balls of fabric fibers, also known as "dust bunnies". Daily activities can stir
up dust into the air. Like other allergens, dust can trigger allergic reactions
to people who are sensitive and can lead to sneezing, runny nose, and
Dust particles are made up
of a wide variety of things including dead skin from humans and pets, finely
ground plant and insect parts, minute particles of sand and soil, and fabric
fibers from clothes, carpets, and upholstery. Dust typically accumulates in
carpets, on horizontal surfaces, computer and TV screens, and sometimes clumps
into dirty balls of fabric fibers, also known as "dust bunnies". Daily
activities can stir up dust into the air. Like other allergens, dust can trigger
allergic reactions to people who are sensitive and can lead to sneezing, runny
nose, and itchy-watering eyes.
dust mite debris
Dust mite debris is made
up of the excrement and fragments of dust mites, which are tiny microscopic
animals related to ticks and spiders that live in virtually every home.
An electrostatic charge has
been placed on the fibers of Filtrete filters so that they act like tiny magnets
to attract and capture particles. A Filtrete filter with electrostatically
charged fibers performs better than non-electrostatic filters. The actual
effectiveness of an air filter in allergen reduction depends on a variety of
factors including the amount of air that the filter processes, the nature of the
allergens, and the rate at which the allergens are being introduced into the
home. Electrostatic filters are most effective when new and clean.
charged fibers act like tiny magnets to attract and capture particles
that can pass right through fiberglass filters or other non-charged pleated
filters. A Filtrete filter with electrostatically charged fibers performs better
than non-electrostatic filters. The actual effectiveness of an air filter in
allergen reduction depends on a variety of factors including the amount of air
that the filter processes, the nature of the allergens, and the rate at which
the allergens are being introduced into the home. Electrostatic filters are most
effective when new and clean.
forced air system
Forced Air System is a
heating system in which heated air is blown by a fan through air channels or
ducts to rooms.
Formaldehyde is a volatile
organic compound (VOC). Potential sources in the home include pressed wood
products such as particleboard or fiberboard; smoking; and glues and adhesives.
HEPA is an abbreviation for high
efficiency particulate air [filter], a rating used by the Department of Energy
to denote an air cleaner or filter that is 99.97% efficient or better at
removing 0.3 micron-sized particles from the air passing through it.
Humidity is the amount of water
vapor in the air.
An Irritant is a substance that,
when breathed in, irritates the airways and can trigger asthma symptoms. Common
examples include strong perfumes, cigarette smoke, and fumes from harsh cleaning
Lint consists of particles and short
fibers that fall off a fabric product during the stresses of use.
Substances of low toxicity are
materials which have a low ability to produce irritation, illness or damage to
an exposed organism.
One micron is one millionth of a
meter or approximately 1/25,000 of an inch. For comparison, a human hair is
50-70 microns thick.
Microparticles are the
smaller particles in the air that are between 0.3 and 1.0 micron and include
fine dust, smoke, smog, bacteria and some pet dander and pollen particles.
Moisture is diffuse wetness that
can be felt as vapor in the atmosphere or seen as condensed liquid on the
surfaces of objects; dampness.
Mold is a fungus that grows in damp or
very humid areas and generates spores that can produce allergic reactions.mold
Mold spores are generated from mold, which
is a fungus that grows in damp or very humid areas and can often produce
include 3-month pleated, washable and fiberglass filters that do not have
electrostatically charged fibers. A Filtrete 1" or 4" residential filter with
electrostatically charged fibers will perform better than 1" and 4" residential
Pet dander is made up of old scales; shed
animal skin and dried saliva. It is extremely lightweight and tiny in size
(approximately 2.5 microns) and can stay airborne for hours and settle on
surfaces. Pet dander can be trouble for people who are sensitive to pet dander
and if they are allergic to dander, it can worsen breathing problems.
Pollen is made up of light, dry
protein particles from trees, grasses, flowers and weeds. It is carried by the
wind and is a potent stimulator of allergic responses.
Radon is a colorless, odorless gas
that seeps up from the earth. It is created by the natural decay of uranium in
the earth, and exists naturally in many locations. Radon may present a serious
health risk when it accumulates in basements or crawl spaces beneath homes.
Smog is the most visible form of air
pollution. It is a brownish-yellow, hazy cloud caused when heat and sunlight
react with various pollutants emitted from industry, cars, pesticides and
oil-based home products. The word "smog" is a combination of the words smoke and
Smoke can be generated by several
things including cigarettes, cigars, wood burning stoves, and fireplaces. In
addition to several known carcinogens, smoke can contain fine particles composed
of wood tars, gases, soot, and ashes. In addition to causing the typical
allergic reaction like sneezing and runny nose, exposure to smoke can cause
burning eyes, bronchitis, and can even trigger asthma attacks to people who are
A virus is incredibly small
and simple. It's not really a living organism, in that it doesn't have a
cellular structure, and it can't metabolize food or reproduce itself outside of
a host cell. Once inside our cells, viruses can cause diseases. Like bacteria,
viruses can be found nearly everywhere - particularly in our modern, tightly
sealed homes. Unfortunately, the tiny particles floating around our houses carry
viruses from place to place, and from person to person.
VOC volatile organic compound
Compounds (VOC): Compounds that vaporize (become a gas) at room
temperature. Common sources that may emit VOC's into indoor air include
housekeeping and maintenance products, and building and furniture materials. In
sufficient quantities, VOC's can cause eye, nose, and throat irritations,
headaches, dizziness, visual disorders, memory impairment; some are known to
cause cancer in animals; some are suspected of causing, or are known to cause,
cancer in humans. At present, not much is known about what health effects occur
at the levels of VOC's typically found in public and commercial buildings.