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HEGA Filtration

This is an Austin Air trade name and is an acronym that stands for High Efficiency Gas Adsorption filtration. This is a four-stage system of filtration that provides HEPA filtration combined with an Activated Military Carbon Cloth filter to remove a wide variety of odors and gasses.


HEPA is an acronym that stands for High Efficiency Particulate Air and is used to indicate a very high level of filtration achieved by vacuum cleaners and air purifiers. A HEPA filter must remove 99.97% of all particles as small as 0.3 microns in size from the air that passes through it.

The phrase "as small as" is important because it designates that if all the particles were 0.3 microns in size, the filter would still have a 99.97% filtration efficiency. The term "down to 0.3 microns in size" does not refer to the same filtration performance as it may refer to a mixture of particle sizes for the stated efficiency.

HEPA filters may be certified, which means that they are tested and then identified with a certification number that provides assurance that the HEPA filter is actually providing the levels of filtration being claimed. Certified HEPA filters are also known as True or Absolute HEPA filters.

Because very small particles are the most damaging to health, getting true HEPA filtration is very important, especially to people that already have allergies, asthma or other respiratory illnesses. But HEPA filtration is only one part of the equation. If the HEPA filter is installed in a vacuum cleaner that leaks air prior to the filter then harmful particles of all sizes are recirculated into the room air where they remain suspended for long periods and can be easily inhaled.

True HEPA filtration of all the air that is picked up by a vacuum cleaner is obtained when using a certified vacuum cleaner such as Miele or Sebo where the entire vacuum cleaner is subjected to testing (not just the filter) and has been proven to retain 99.97% of all particles as small as 0.3%.

The term HEPA is used primarily in the United States. European companies generally refer to the same filter as an S-Class filter, which means that it meets stringent standards such as the European Norm 1822 for filtration performance.


This is a term that may indicate that a particular bag or filter is manufactured much like a true HEPA filter or that higher than normal levels of filtration are being provided by the vacuum cleaner or air purifier. However, it should be noted that "HEPA Type" or "HEPA Like" is not true HEPA filtration. While HEPA type filters may provide superior filtration than regular filters, check carefully to understand what the actual filtration efficiency (See "Filtration Efficiency" and particle sizes retained actually are. Also, the system may not be completely sealed which means that while the filter may provide the claimed levels of filtration in a laboratory, if air bypasses the filter when the appliance is in use, these levels of filtration will not be obtained.

HEPA Type Bags

This is a term that indicates a higher level of bag filtration than normal dust bags. Be aware that while these bags may offer significant improvement over normal bags it is unlikely that they meet the stringent specifications for true HEPA filtration. Some companies are even using the HEPA acronym but changing the words that it stands for! "HEPA Type" is not true HEPA. Check carefully to understand what the actual filtration efficiency (See "Filtration Efficiency") and particle sizes retained by "HEPA Type" dust bags actually are.

HEPASilent Technology

This is a Blueair trade name for a combination of mechanical and electrostatic filtration that captures 99.97% of particles at 0.1 micron on level one. At this speed the air purifier not only filters at very high levels but also functions very quietly.

HealthcarePro Dustbags

A Lindhaus trade name for high filtration dustbags.

High Velocity Airflow Tools

These are tools used with Dyson vacuum cleaners and direct high velocity airflow down into the carpet pile. This directional airflow agitates and dislodges dust and dirt for easy removal. Also, because there is constant airflow curtains or upholstery fabrics will not become stuck to the tool during vacuuming.

"Hot Gas" Defrosting

When dehumidifiers operate at low ambient temperatures frost can build up on the refrigeration coils, rendering the dehumidifier ineffective. "Hot Gas" Defrosting uses the hot compressor gasses to thaw the refrigeration coils for continual operation.


An instrument that is a component of a humidifier or dehumidifier that that measures the amount of moisture in the air and turns a humidifier or dehumidifier on or off accordingly, in much the same way a thermostat regulates heating or cooling.


See "Humidistat".

HyperHEPA Technology

This is an IQAir trade name for a patented filtration system used in certain models that filters down to 0.003 microns with a guaranteed minimum efficiency of 99%. This system is individually tested and certified using EN 1822 standards.

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