An air purifier is a device for suppressing domestic and industrial pollution, it filters the air and removes odors.
Air purifiers improve air quality. They are used by industry to filter and remove toxic residues, hospitals and airlines to prevent the spread of viruses and bacteria. They are also used in offices and homes to improve hygiene, the quality of life of each individual and reduce the risk of contagion and disease.
- AeraSmart sensor automatically detects and purifies the air
- True HEPA filter with AeraSafe antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns including pollen, ragweed and other allergens such as viruses, germs, dust mites, mold spores and cigarette smoke
- Certified asthma & allergy friendly by the Asthma and Allergy Foundation of America
- Special mode for cold and flu season - extremely effective at capturing influenza virus from indoor air (based on independent testing)
- Recommended for medium sized rooms from 200 to 400 square feet
Fellowes AeraMax Purifiers
- Very efficient, quiet, and compact
- Automatically detects contaminents and purifies the air
- Special high performance mode for allergy, cold and flu seasons
- Carbon filter captures household odors, pet odors, cooking odor and cigarette smoke
- Certified asthma & allergy friendly by the Asthma and allergy Foundation of America
- Bright blue lights
- Can be too sensitive in "Auto" setting
- Can become unstable on uneven floor
Remember that removing sources of pollution when possible is more effective than trying to clean already-polluted air. But if that’s not an option, or if it’s not enough, the AeraMax 200 Air Purifier should help further clean the air in your home or office. If effective particle filtration is what you’re after to help deal with allergies or poor air quality, this is a great pick.
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How to Choose the Best Air Purifier for Allergies?
There are many types of air purifier also called air cleaner or air freshener but how to choose the proper model?
The criteria to consider when choosing an air purifier:
Air cleaners or air fresheners solve a certain number of specific issues.
1- Problem to solve
What is the problem you want to solve?
1- Asthma and allergy (elimination of allergens). HEPA filtration is recommended here.
2- Rhinitis, conjunctivitis, irritation of ENT tract, increased respiratory failure may be related to indoor air pollution. A complete particules treatment and Volatile organic compounds (VOCs) is advised
3- Prevention of diseases (including allergies) for children (removal of VOCs and allergens). Filtration for particles and oxidation or trapping for products VOC. The ultra-fine filter can also trap viruses, mold, spores and bacteria thus reducing the cycle of the disease in the family circle.
4- Odor (pet, cat litter, food smell …). The oxidation of VOC and their trapping in activated carbon are the solution.
5- Smoke (tobacco, fireplace …). Filtration for particles and oxidation or trapping for VOC products.
2- Available techniques for air purification
Air cleaners or air fresheners have many different purifying techniques available. What purification methods are effective?
What is a HEPA filter can remove?
1- HEPA. Very fine filtration to retain 99.97% of 0.3 microns particles, which represent 80% of the particles in the air indoor. Featured by many systems. Be especially vigilant about the tightness of the filter compartment to ensure that all the air passes through the filter. Plan to replace the filter regularly.
2- Activated carbon filter: it can trap VOCs (odors, formaldehyde, benzene…). VOCs are especially trapped when they have a long carbon chain (large molecule). Because, formaldehyde is not easily trapped. Plan to replace the filter regularly.
3- Electronics: It uses high voltage for polarizing surfaces and polarizes the incoming particles, which are then collected. Their efficiency is not very good due to the fouling of polarized surfaces. The risk is the generation of ozone.
4- Electrostatic: capture of particles by electrostatic attraction. Require frequent filter replacement because it quickly becomes ineffective.
5- Ionizer or ion generator: The principle is to polarize the particles using a powerful electric field to catch them on a dedicated surface. The risk is the generation of ozone.
Oxidation of VOC:
Photocatalysis: oxidizing action of UV on the organic molecules in the presence of a catalyst (titanium oxide). Oxidation produces CO2 and water. Risk is the incomplete degradation of molecules to produce byproducts more harmful than the initial. It is for example possible to find appliances producing Formaldehyde. In addition, the effects on health of titanium oxide nanoparticles in the air are unknown.
This technique is widely used but cannot be recommended for two main reasons:
1- Its effectiveness: indeed it is clearly demonstrated that the ionization alone has no effect on air pollutants. It may be coupled with a filtration but in this case it loses its role.
2- Its effect on health: the WHO (World Health Organization) in fact does not recommend ionization as a method of treatment because it products ions that have a negative effect on health.
3- Types an air purifier installations
There are two types of air purification setups:
1- Mobile or local, the device is placed directly in the room to be treated.
2- Fixed on the ventilation circuit. We are talking about residential air cleaners or filtration plant.
4- What features of an air purifier are important?
1 – filtration efficiency, air volume treated and system sealing
This criterion is very difficult to evaluate. If the standard HEPA ensures the qualities of the filter used, there is no evidence of the effectiveness of the filtration. In fact, for an air purifier to operate, it is necessary that the air passes into the filter! However it is often noted that after some filter changes a part of the air passes next to the filter significantly reducing efficiency.
|Unreliable HEPA filter|
|Reliable HEPA filter|
The efficiency depends on the contact area between the air and the filter. The larger the area the greater the filter will be effective and longer you can keep it operational. Unfortunately this parameter is very rarely communicated.
For activated carbon, the activated carbon weight used can be a good comparison.
The volume of air treated is an indicator that is wise to combine with the filtration efficiency.
It is advised to treat at least once per hour the air of a room.
2- power consumption of an air purifier
One of the criteria of efficiency of the purifiers is the operation time. For a purifier to be effective it is necessary that it runs continuously because the “polluters” are constantly produced (a particle furniture for example).
You can find air purifier today with HEPA and VOCs filters consuming less than 5W.
3- operating costs
The operating cost is a criterion to consider initially in order to avoid surprises after a few months.
Look at the replacement frequency of the filter and multiple by the number of times it is necessary to change each year.
Air purifiers solve health problems at home by a direct action on pollutants but they actively participate in the prevention of allergies by removing pollutants responsible for sensitization and allergens. Air purifiers will likely equip all our houses in the near future until the materials used have become healthy.