Glossary Airborne particles Airborne particles 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 h


Airborne particles

Airborne particles 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 through ordinary furnace filters and return to the air in your home. This can negatively impact your indoor air quality.


An allergen is a substance capable of producing a reaction in people sensitive to allergens. In the case of people with asthma, allergens that are inhaled 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 pollen, certain foods or microorganisms. Common indications of an allergy may include sneezing, itching and skin rashes.


Asthma is a chronic, inflammatory lung disease characterized by recurrent breathing problems. Symptoms can be triggered by allergens, as well as infection, exercise, cold air and other factors.


Bacteria are living organisms, microscopic in size, which usually consist of a single cell. Most bacteria feed on organic matter and produce waste products. Bacteria are everywhere—on everything we see and touch, and even in the air we breathe.

Chemical Emission

Chemical emissions are gases or particulates that have been released into the air.

Carbon Monoxide (CO)

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.

Combustion Pollutant

Combustion pollutants 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 composed of a wide variety of particles including dead skin from humans and pets, finely ground plant and insect parts, minute particles of sand and soil, and fabric fibers. Daily activities can stir up dust into the air. Dust can trigger allergic reactions in sensitive people, and can cause sneezing, runny nose and itchy/watering eyes.

Dust Mites

Dust mites are tiny microscopic creatures related to ticks and spiders. Dust mites feed on skin flakes and can be found throughout the home, in mattresses, pillows, carpets and furniture. They produce airborne particles that can trigger allergic reactions or asthma episodes when inhaled by people who are sensitive to them.

Dust Mite Debris

Dust mite debris is made up of the excrement and fragments of dust mites.

Electrostatic Charge

The electrostatic charge of Filtrete air filters acts like a magnet to attract and capture particles that can pass 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

A forced air system is a heating and cooling system in which 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 stands for High Efficiency Particulate Air. This is a rating system 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.


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 fluids.


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.

Microparticle Performance Rating (MPR)

The 3M MPR (Microparticle Performance Rating) reports a filter's ability to capture tiny particles between 0.3 and 1 micron in size.


Microparticles are tiny airborne particles measuring between 0.3 and 1.0 micron. These include fine dust, smoke, smog, bacteria and some pet dander and pollen particles.

Mold Spores

Mold spores are generated from mold, which is a fungus that grows in humid conditions. These spores can produce allergic reactions.

Non-electrostatic Filters

Non-electrostatic filters include 3-month pleated, washable and fiberglass filters that do not have electrostatically charged fibers. Filtrete 1" and 4" residential filters with electrostatically charged fibers have been proven to perform better than 1" and 4" residential non-electrostatic filters.

Parasitic Cysts

Parasitic cysts are egg-like sacs formed by the larva of a parasite. Sometimes found in unfiltered tap water, parasitic cysts can cause serious gastrointestinal infection and illness if consumed.

Pet Dander

Pet dander is made up of shed animal skin cells and dried saliva. It is extremely lightweight and tiny (approximately 2.5 microns in size) and can stay airborne for hours before settling on surfaces. Pet dander can be problematic for people sensitive to pet dander. 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 can a potent stimulator of allergic reactions.


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.


Sediment is solid material that settles to the bottom of a liquid. In unfiltered tap water, sediment can be composed of soil, silt, sand and minerals.


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 fog.


Smoke can be generated by 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. While it can cause the typical allergic reaction like sneezing and runny nose, exposure to smoke can also cause burning eyes, bronchitis and even trigger asthma attacks to people who are sensitive.


A virus requires host cells to survive. Once inside our cells, viruses can cause diseases. Like bacteria, viruses can be found nearly everywhere—particularly in modern, tightly sealed homes. Airborne particles in your indoor air can carry viruses from place to place, and from person to person.

Volatile Organic Compound (VOC)

A VOC is a compound that vaporizes at room temperature. Common sources that may emit VOCs into indoor air include cleaning and maintenance products, and building and furniture materials. In sufficient quantities, VOCs can cause eye, nose and throat irritations, headaches, dizziness, visual disorders and memory impairment.

Some VOCs are known to cause cancer in animals, and 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 VOCs typically found in public and commercial buildings.

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Filtrete On Demand

Backed by extensive 3M research; independent testing and in-home use tests, each Filtrete Filter is designed to meet the specific needs of homeowners and businesses. Filtrete Filters are designed to achieve the proper balance between particle removal efficiency and pressure drop (air flow). An electrostatic charge is applied to the filter media fibers, which attract and capture airborne particles.

In Door Air Quality - You care about the quality of your indoor air, and Filtrete air filters ensure that you breathe the difference. The filter’s electrostatically charged media attracts and captures large and microscopic particles, including pollen, mold spores, pet dander, bacteria, smoke and particles that can carry viruses and odors.

Air Conditioning and Furnace Filter Performance – Filtrete air filters help properly designed forced air systems function well by cleaning the air without excessive air flow restriction. All Filtrete filters have a pressure drop less than .20 on a water gauge which is less than most competitor’s entry level filters.

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