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Furnace filters .pdf

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Different Types of Air Filters Explained

If you desire better indoor air quality, then you require a quality air purifier. Air purifiers reduce
the airborne pollutants that aggravate asthma and allergies. As filthy, contaminated air flows
through the air conditioner, fresh, clean air flows into your home. The sort of air filter in an air
purifier determines how the air purifier works - and how well it functions.

HEPA Filters
HEPA air filters set the standard for air cleaners today. In the 1940s, the U.S. Atomic Energy
Commission developed HEPA (High Energy Particulate Air) filters in an effort to filter
radioactive contaminants. To be categorized as a HEPA filter, it must catch no less than 99.97
percent of pollutants at 0.3 microns.
HEPA filtration captures particles 25-50 times bigger than the eye could see. The ultra-fine
fibers in HEPA filters capture microscopic particles via a combination of diffusion, interception,
and inertial impaction. With bigger particles, diffusion takes place when the random motion of
the particles makes them collide with fibers. Interception occurs when bigger particles directly

collide with a fiber. When a particle's inertia contributes to its crash with a fiber, this is referred
to as inertial impaction.
HEGA Filters
You might also have heard of HEGA or High Efficiency Gas Adsorber filters. Particular to
Austin Air, HEGA filters have to demonstrate a minimum efficacy of 99.9%, per criteria of the
Institute of Environmental Sciences, also utilize "adsorber" filtration to filter out chemicals,
gases, and odors.
Adsorber filter combines carbon or carbon carbon/zeolite pellets into a carbon cloth filter to trap
gaseous particles. Specific into the HEGA filter, the adsorber filtration system must be designed,
assembled, filled and packed to adhere to those particular standards. The HEGA air filter should
also remove irritants like pollen, dust, mould spores, bacteria, and pet dander to be regarded as a
HEGA filter.
The Austin Air Allergy Machine Series comprise HEGA filtration. Austin Air found and
developed the brand new HEGA technology, which involves weaving carbon to a lightweight
cloth. The Austin Air Allergy Machine is the ideal air purifier for somebody who wants to
remove gases, vapors, and odors in addition to allergens and other particulate matter.
Activated Carbon Filters
Activated carbon filters remove gases, odors, and chemical toxins. Carbon, or activated charcoal,
is treated with oxygen to open up the millions of tiny pores between the carbon atoms.
The activated charcoal adsorbs odorous substances from gases or fluids. The expression
"adsorbing" describes the manner by which the pollutants attach to the charcoal by chemical
attraction. The huge surface area of the activated charcoal provides it thousands of pores for
trapping pollutants. As compounds and pollutants pass the carbon surface, they're immediately
attracted and captured inside the filter.
Some carbon filters are treated with added compounds like potassium iodide or potassium
permanganate which improve the carbon filter's ability to catch Volatile Organic Compounds
(VOCs) and other chemically reactive gases. Activated carbon filters adsorb a wider array of
AllerAir air purifiers use an activated carbon filtration system to effectively clean indoor air.
AllerAir versions include a cylindrical shape for optimum air flow, a powerful four-stage
filtration system, and a silent fan.
Electrostatic Filters
Like Activated Carbon filters, Electrostatic filters attract pollutants. Rather than carbon,
Electrostatic filters use electrostatic charges to wash out the air. Electrostatic charges are made
by pushing air through a listing of static vulnerable fibers. As airborne particles proceed past the

static prone fibers, they become attracted to the static charge and are captured within the filter.
The particles remain on table plates until they are hand washed or eliminated by a HEPA vacuum
By using static electricity, you never need to worry about replacing the filters, because most
electrostatic air cleaners use collection plates to capture pollutants and can be washed easily. On
the other hand, the collection plates have to be cleaned regularly to make sure effective air
cleaning. Additionally, unlike HEPA filters, a few electrostatic filters emit ozone, a harmful lung
irritant that can trigger asthma and asthma symptoms, in addition to other respiratory troubles.
Procuring an air cleaner that does not emit any ozone increases the amount of truly clean air in
your property. Friedrich air purifiers have the very best electrostatic filter in the marketplace and
emit minimal amounts of ozone.
Charged Media Filters
Charged media filters additionally utilize electrostatic energy. Made from synthetic fibers, the
media filter is charged through the manufacturing process and retains the fee during its usage.
This charge attracts airborne particles, providing them an electrostatic charge prior to trapping
them inside the fibers of a traditional filter.
Social media filters present comparatively low energy prices and are really efficient. However,
because the filter becomes bloated, it becomes resistant to the airflow, making it less efficient the
more soiled it becomes. Therefore, charged media filters must be changed regularly for peak
Charged media air cleaners have been known for their energy-efficiency and
quietnessnonetheless, a number of them might emit ozone. Blueair air purifiers use the best
charged press filtration, do not emit ozone, and are very quiet and efficient.
Hybrid Air Filtration Systems
The Hybrid air filtration system maximizes its effectiveness through the use of numerous
technologies. Hybrid air purifiers utilize a combination of filtration procedures, each filter
comprising to the overall effective quality of the air conditioner. Most effective air purifiers a use
mixtures of the filters listed above.

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