The HEPA filter removes allergens like pollen, dust, and dander, while the ultraviolet lights kill airborne bacteria and viruses. These two powerful purifiers work in combination with an odor-killing activated carbon filter. The ionizer minimizes pollutants without producing harmful ozone and can be manually turned on and off.

Most people are concerned about the noise level of an air purifier. This unit is whisper quiet at its lowest speed, but somewhat louder on medium or high setting. In a living room you can hardly hear it running. The white noise it provides at night is pleasant for sleeping.

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This unit cleans the air extremely well and is suitable for a room of about 200 sq ft or less. The controls are easy to use and there is an LED readout that lets you know when you need to replace the HEPA filters. The filters do last a long time. The replacement UV lamps are a bit pricey and some people substitute a less expensive brand with the same specs.

Many people find that an effective air purifier does wonders for relieving their allergy symptoms. Some buyers comment that this unit cleans so well, after a night of use the bedroom air feels fresher than the morning air outside.

Alen is known for making quality air purifiers and this model is no exception. It would be a good choice for smaller rooms.

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Here are some of the features of the Alen Tower Air Purifier T300:

• - Pre-filter/Allergy-HEPA Filters
• - Enhanced activated carbon filter for even greater odor removal
• - Effectively removes smoke, pollen, dust, animal dander, dust mites, molds, bacteria and viruses
• - Built-in ozone-free ionizer to effectively minimize pollutants
• - UV lamp for bacteria removal
• - 11 x 9 x 28 inches; 15 pounds

Here is what current owners have to say about the Alen Tower Air Purifier T300:

Michael Costa: “Living in Georgia with all the pollen I developed allergies. I would sit in my den watching TV and find myself getting stuffed up and congested. That all stopped (with no medications) when I got the T300. I have bought several air purifiers but only the Alen T300 has made a noticeable and lasting difference in the air quality in my home. I own 2 and sleep with one in my bedroom. I sleep much better and can actually breath freely all night. I have had no problems with either unit and highly recommend the Alen products to anyone looking for a top rated trouble free unit.”

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Unlike traditional air purifiers, this air humidifier and cleaner does not require changing filters. Instead, water is the filter. Water in the unit evaporates daily to humidify the air in a dry room. At the same time, dirt and dust particles adhere to the interior disk assembly and are collected in the lower housing as water evaporates. Operation requires a special additive that allows water to sheet off the rotating plastic discs.

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No claims are made about the percentage of impurities this unit removes from the air. The residue left in the water chamber shows that it’s collecting dirt and allergens. Buyers report that the air smells fresher when the unit is running. But is the Venta is doing enough air purification to justify the price? Hard to say.

The Venta must be thoroughly cleaned every few weeks. However, the task is made more difficult by the many hard-to-clean crevices in the unit.

Some users say that this is a quiet, simple, and well-built humidifier. Others complain that the simplicity of design is a real drawback. For example, the unit has no water level indicator, no shut-off when the water dries out, and no humidistat to turn it on and off automatically. While some people find the humidity maintains at just the right level, others notice excessive dampness. Because the unit is a combination humidifier and air cleaner, you can’t run one function without the other.

If you’re looking for an air humidifier, this may be one to consider. However, if you suffer from allergies and you want the true benefits of cleaner air, you should buy an air purifier with a HEPA filter.

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Here are some of the features of the Venta Airwasher LW24 Air Humidifier and Purifier All-in-one:

• - Uses no filter pads
• - Cleans with a consistently high level of effectiveness, as water doesn’t clog the way filter pads do
• - Extremely quiet – ideal for use in bedrooms
• - Visible purifying performance – pure water evaporates, leaving dirt trapped in the tank
• - Odorless – no smell of moldy filters or stagnant water

Here is what current owners have to say about the Venta Airwasher LW24 Air Humidifier and Purifier All-in-one:

Shelley Ureel: “This is my second Venta Airwasher I have purchased. They work as far as keeping the dust down. I keep it next to the bird cages to keep the feather dust down. The 10 year warranty is a plus… The only down side is having to fill it with water about every other day and then cleaning it about every 2 weeks.”

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It uses two separate filters to remove smoke, pollen, dust, animal dander, dust mites, molds, bacteria, viruses, and odors from your home. The vacuumable HEPA filter lasts one to three years and the charcoal prefilter lasts about three months.

The LED monitoring system tells you how much life is remaining in the filters and when they need to be changed. Filter replacement is simple, and new filters can be ordered separately.

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It moves a lot of air without being too loud, circulating the room’s air about six times per hour. The unit has three speeds. On the medium or high fan setting this unit will add background noise, but on low, it is hardly noticable if it’s not right next to you.

The Honeywell 17000 is easy to set up and operate. You will quickly notice a crisper feel to the air and huge reduction in airborne dust.

Some buyers with asthma particularly recommend the unit, because it dramatically decreases the amount of allergens in the air and lets them breathe more easily.

This is a effective and quiet air purifier that delivers exactly what it promises, at a reasonable price.

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Here are some of the features of the Honeywell 17000 Permanent Pure HEPA QuietCare Air Purifier:

• - Removes up to 99.4 percent of bacteria and germs
• - New permanent lifetime true HEPA vacuumable filter
• - QuietCare technology for ultra quiet operation
• - 3 speeds with filter clean monitor
• - Recommended for medium rooms
• - 15.8 x 13.1 x 17.1 inches; 13 pounds

Here is what current owners have to say about the Honeywell 17000 Permanent Pure HEPA QuietCare Air Purifier:

Mary Mccarty: “I bought this air purifier after looking at many reviews. I found some that rated higher, but were quite a bit more expensive. This one had a HEPA filter, which is the most important feature for people with asthma or allergies, and the price was not so high that I felt it would be a financial stress during these economic times. After the first few days of use I was sleeping much better and my asthma was gone when I was at home. In addition, I wasn’t sneezing from the high pollen count! So, in conclusion, I’m very happy with my Honeywell air purifier. A very good purchase!”

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The unit holds a true HEPA filter and a carbon pre-filter that keeps larger particles from clogging the HEPA filter while helping to reduce household odors. The 3-speed fan quickly removes dust, pollen, tobacco smoke, and cat dander from the air. The purifier also helps reduce airborne germs, bacteria, mold spores and fungus with up to 100-percent efficiency as well. Within a room up to 225 square feet, the air is fully processed once every 12 minutes.

The Honeywell 18155’s no-draft technology provides efficient air cleaning without the cool-air exhaust. The unit pulls in air from the room and blows out purified air at a 360 degree orbit. Unlike a fan, the air flow is not direct, though you may feel chilly if you are sitting close by.

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On the highest fan setting, the air purifier is about as loud as a dishwasher from a few feet away, if that. On medium and low, it’s very quiet and doesn’t interfere with TV viewing or conversation.

The unit is lightweight and easy to open when you want to access the filters and there’s an indicator that lets you know when the HEPA filter needs to be cleaned.

People who buy the air purifier to combat allergy symptoms usually find it very helpful, and many comment that their quality of sleep has improved. Households with pets appreciate the way the unit rids the air of doggy smells or litterbox odors.

You don’t really need to run the air purifier on high all the time. You can run it on high for the first day and perhaps while cleaning the house. At other times you can run it on medium or low setting and it will maintain air quality.

Buyers in general have no complaints about this air purifier except for noise. However, most people find it quieter than expected. Keep in mind that it’s a little unreasonable to expect no noise at all from an appliance that contains a motor and a fan.

This is a well-made product that can be a good investment for your home.

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Here are some of the features of the Honeywell 18155 SilentComfort Permanent, True HEPA Air Purifier:

• - Air purifier with hepa filter for rooms up to 225-square-feet
• - Quietly cleans the air with no cold exhaust draft
• - Easy to clean with household vacuum twice a year
• - HEPA filter never needs replacement
• - Electronic filter clean reminder
• - Removes up to 100-percent of bacteria and germs that pass through
• - 19-3/8 L by 19-3/8 D by 19-inch H

Here is what current owners have to say about the Honeywell 18155 SilentComfort Permanent, True HEPA Air Purifier:

P. Drew: “We are on our second SilentComfort Air Purifier. We have had one of these that ran 24/7/365 for about 8 years and the motor bearing finally gave out. I think that was a lot of use and we got our money’s worth on the first one. We replaced it with one exactly like it because we really missed the pleasant white noise it adds to our bedroom. Both the clean air and the soothing noise help us to sleep.”

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The true HEPA filter in the air purifier efficiently rids the air of pollen, cat dander, household dust, and mold spores, as well as filtering out many airborne bacteria and germs. In addition, the charcoal pre-filter removes smells from tobacco smoke, cooking, pets and plants. Warning lights will come on when the HEPA filter or pre-filter need to be cleaned or changed. This helps you to maintain your machine in excellent working order.

The Honeywell unit moves a lot of air. The air enters into and flows out of the unit in a 360 degree pattern, so the air purifier needs to be placed where the air flow is not disruptive to nearby objects or people.

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The two factors that may discourage people from buying this model are its size and its noise level. The unit is larger than some people realize – check the measurements to gauge how it will fit into your room.

Everyone agrees that the unit makes noise; however, opinions differ on how irritating the noise is. What is “too loud” to some people is quite acceptable to others. Some people say that the unit’s sound becomes white noise that you can tune out after a while. Others find it loud enough to make conversation or TV watching difficult. Where you place the unit will affect the overall noise level, of course.

The fact is that all air purifiers make some noise. You are the only one who can decide whether the benefits of cleaner air outweigh the minor annoyances. Many buyers find that their allergy symptoms are greatly improved after this air purifier has been working.

If you don’t mind the size and the noise level, this is a very effective air purifier that will help keep your home environment cleaner and healthier.

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Here are some of the features of the Honeywell 50250 99.97% Pure HEPA Round Air Purifier:

• - Electric air purifier for large rooms; removes 99.97 percent of particles passing through
• - Removes up to 99.4 percent of tiny particles like bacteria and germs
• - Lifetime True HEPA filter vacuums clean for easy maintenance
• - Patented 360-degree air intake and discharge for purifying large areas
• - 3 speeds with filter-clean monitor; accepts #38002 charcoal and #24000 HEPA filters
• - Dimensions: 18 x 18 x 19.6 inches; 23 pounds

Here is what current owners have to say about the Honeywell 50250 99.97% Pure HEPA Round Air Purifier:

Anonymous: “While this product has both pros and cons, having lived with it for a month, I’m VERY pleased with its overall performance. There is absolutely no dust visible in the air, even when looking for some particles near a sunlit window. None. Zero. The unit is fairly large, about half the size of a steel garbage can brought to the curb. This may be an issue for some people, but conversely, a smaller unit would not move (and therefore not filter) as much air…. We are very happy with the unit, and will buy additional units for other areas of the house in the future.”

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If you’d like more information about the Honeywell 50250 99.97% Pure HEPA Round Air Purifier, you can get further details, customer comments, and the latest special price here on Amazon