Most Helpful Customer Reviews
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98 of 101 people found the following review helpful:
5.0 out of 5 stars
The best..., October 23, 2007
Review of 3M Filtrete - Ultra Allergen
These are outstanding air filters, based on the lack of dust and clean air inside our house; the build quality of these filters; and the fact that they have such a high rating. We've been using these filters for about 10 years in a Trane heat pump system, with no issues.
This filter has a 3M Micro-particle Performance Rating of 1250. "MPR" focuses on a filter's ability to capture the smallest particles between 0.3 and 1 micron. The higher the MPR, the more effective the filter is, and the more expensive. The "basic" Filtrete is the least expensive. These are near the top-end. Their highest filter is MPR rated at 1700, but costs about 1/3 more that this one, and I can't tell the difference; although someone with allergies probably could. See TYPES OF FILTRETEs after this review for more information.
Ours is a two-story house with a basement. There are two returns in the system, high in the wall, one each on the first and second floors. Several years ago, to do an even better job of air cleaning, and to keep the inside of our ducts clean, I replaced both return grilles with a grille assembly that has a built-in "furnace" filter holder. We use 3M Filtrete Ultra Allergens in the system's air exchanger and at each of those returns. In other words, all air flows through two Filtretes, which has been no problem for our heat pump's air exchanger. (Since there's no gas or oil "fire", it's not called a furnace). With this setup, the 3 filters need replacement every six months. Before adding the two return filters, we replaced the single air exchanger filter every 2 months, so total filter cost is the same.
One reviewer said: "little did I know the extra drag on the air flow would cause my Lennox Heat Pump to burn up." All filters cause some drag on air flow, but the only way that could become a significant drag is if the filter was very dirty, which would be the fault of the homeowner for not replacing it. In my setup, if a filter is overdue for replacement, it arches in the middle (from the air drag) towards the fan's suction, and the air whistles as it rushes around the filter. Dirty filters reduce the efficiency of heat pumps or furnaces, but claiming a heat pump "burned up" because of a high-efficiency filter's air drag, is a stretch. It's more likely that his contractor gave him that line to switch blame away from the Lennox equipment, which failed for another reason. I checked the Lennox web site, and they don't even mention disposable filters, which isn't surprising. Imagine Lennox Corporation warning customers not to use 3M filters because their equipment can't handle the stress.
We don't have pets or allergies; we use these filters because they result in very clean indoor air.
TYPES OF FILTRETEs
I did some research, and found that 3M makes three classes of disposable Filtrete 1" filters for heating and cooling systems, with various options within each "class"; 14 different Filtrete filters in all.
- "High Airflow" MPR of 200 - 600; filter options:
Basic, MPR: 200
Dust, MPR: 400
Clean, MRP: 500
Dust and Pollen, MPR: 600.
- "Air Cleaning" MPR of 700 - 1000; filter options:
Micro Particle; MPR: 700
Allergen, MPR 800
Micro Allergen, MPR 1000
Micro Allergen Extra, MPR 1000.
- "High Performance" MPR of 1200 to 1700; filter options:
Allergen, MPR 1200
Ultra Pure, MPR 1250
Ultra Allergen, MPR 1250
Advanced Allergen, MPR 1500
Ultimate Allergen, MPR 1600
Maximum Allergen, MPR 1700
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21 of 22 people found the following review helpful:
4.0 out of 5 stars
Try the Advanced Allergen filter if you have allergies or pets , February 12, 2008
My house uses forced air for heating. The disadvantage of such a system is that it distributes the dust in the air everywhere in the house. However, it is supposed to be possible to filter out the dust. Over the years, I have steadily increased the quality of the filter that I use for my forced air heating system. However, until now I have not noticed any obvious difference in my allergic reactions that seem to start with the heating season.
There are two cats in my house. I have read that cat dander, tiny flakes of cat skin shed by the cats, is five times smaller than household dust particles. It stays in the air much longer than ordinary dust before it settles. Because of its small size it requires a more efficient filter to get it out of the air.
Until this year, I have used of variety of filters with mixed results. However, this year, I started using the 3M Advanced Allergen Filters, the ones in the blue wrapper. These have a 3M Microparticle Performance Rating of 1500, but do not have a MERV rating listed. MERV stands for Minimum Efficiency Reporting Value and is a number from 1 to 12, produced from a test designed by the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE). A higher MERV rating indicates better filter performance. 3M uses particle data between 0.3 and 1.0 micron size to calculate a Microparticle Performance Rating or MPR. The higher the MPR, the better the filter. However, higher rated filters cost more.
Here are some of the Filtrete filters offered by 3M:
Dust & Pollen Filter, Microparticle Performance Rating 600,
MERV rating of 8
Micro Allergen Filter, Microparticle Performance Rating 1000,
MERV rating of 11
Ultra Allergen Filter, Microparticle Performance Rating 1250,
MERV rating of 11
Advanced Allegen Filter, Microparticle Performance Rating 1500,
MERV rating not available
The difference made by the Advanced filter was immediately obvious. My running nose stopped running. I assume that the new Advanced filters must be taking out more of the dust in the air including the cat dander. I have not noticed a change in the speed of the circulated air. The additional cost of the Advanced filter is worth it if you have allergies or pets. However, if you are happy with a lower-rated and lower-cost filter, then you can continue using that one. I suggest that you check Amazon and vendors on the web to get the best price.
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11 of 11 people found the following review helpful:
5.0 out of 5 stars
It Works For Me..., August 24, 2007
I have cats and an air return near the floor, so having a good filter is high priority. I've use Filtrete Ultra Allergen filters for 9 years, 5 years with an old A/C & Heat Unit, and the last 4 years with a new dual speed Carrier A/C & Heat Unit. I replaced my old unit before it died, and have had no problem with either unit. I can see no way this filter could cause enough drag to burn out a motor as the previous reviewer suspects. That's a puzzle. As for the Ultra Allergen filter, I don't believe it's the final answer for people with serious allergies, but it certainly will reduce allergens in the household environment.
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