Honeywell CF100A1009 4-Inch High Efficiency Air Cleaner Filter - I Pick This One
You can improve the air quality in your home with Honeywell's whole-house air cleaner filters. Today's tightly-built homes trap dust, allergens and more, which explains why poor indoor air quality ranks among the top five environmental risks to public health. Honeywell Air Filters are significantly more effective and efficient than standard one-inch fiberglass filters, plus they last up to one year. They're easy to install and sizes are available to fit all Honeywell plus most Aprilaire®, Space-Gard®, and Trion Air Bear® models.
Reviews of Honeywell Cf100a1009 4 Inch High Efficiency Air Cleaner Filter
Be aware of MERV rating
Rating by : Pei-Ji Chen, 
Below information is from one website I found for MERV rating. The one I have is 12. This is only 8. That is why so cheap, only 60% of the price.
"MERV ratings are used to rate the ability of an air conditioning filter to remove dust from the air as it passes through the filter. MERV is a standard used to measure the overall efficiency of a filter. Higher MERV ratings mean fewer dust particles and other airborne contaminants pass through the filter.
MERV ratings are determined by adding particles of varying sizes (1-12) into a controlled testing environment. The particles are added upstream of the test filter and a laser particle counter samples the air before it enters the filter and after it leaves the filter. The two particle counts are compared to calculate the Particle Size Efficiency of the tested filter. Once this is determined, a MERV Parameters chart is used to determine the MERV rating.
MERV ratings range from 1 - 16 and measurements are in microns. Some of the common particles related to MERV ratings are pet dander, insecticide dust, smog, dust, viruses, wood, tobacco smoke, spores, bacteria and pollen.
Some of the most common filters found in residential use only have a merv rating of 1 to 4. These are typically disposable panel type filters and do not do a good job of filtering the air because they will not stop particles smaller than 10 microns.
Merv 5 to 8 rated filters are a better choice and are more commonly found in commercial applications. These filters will collect particles as small as 3 microns and are a good choice for home owners also.
Filters with a merv rating of 9 to 12 are used in commercial and industrial applications and will stop particles in the 1 to 3 micron range. These filters are a great choice for home owners who want the best dust control possible. When using filters with Merv 9 ratings and above it is important to clean or replace them when recommended by the manufacturer because they will have a negative effect on air flow when they become dirty. This can lead to performance problems and decreased operating efficiency.
The most efficient filters have merv ratings of 13 to 16 and will stop particles as small as .3 microns. These filters are used in hospitals and other super clean environments."
Exactly as described
Rating by : C. Hodges "bufordshighway", 
The filters were exactly as described. I have used this brand before, easily achieving six months on a filter, with no reduction in air flow or obvious increase in air particles. I dropped back to MERV 8 to save energy, as I noticed no real difference in air quality when I used MERV 11 filters. We do not smoke, have high allergy levels, or have animals in the house, so MERV 8 seems sufficient. On the box, the filters suggest they can last up to 12 months, we usually change about every six monthes.
The only issue I have with the Honeywell filters has nothing to do with these filters. Honeywell filters are a strange size, with exact dimensions of 16" x 24 3/4" x 4 3/8. Note some filters are 15.75 inches rather than 16 inches. The filters fit flush into the slot, so even minor size variations make can make the filters not fit in the slot (if too big) or allow air flow around the filter (if too small). Most non-Honeywell 16 x 25 filters fit very loosely in the slot, and I question their effectiveness. When shopping for Honeywell filters, some places describe them as 4 inch and others as five inch. In reading other feedbacks, it is clear that many have ordered the wrong size (as have I). Basically, if you do not have a Honeywell system, do not order Honeywell filters. If you have the Honeywell system, then order Honeywell filters.
Double check actual dimensions
Rating by : GS on Amazon, 
The filter may be great, but I may never know. The dimensions given (16x25x4) are smaller than the actual dimensions of the item (x4.25) and won't fit in the furnace. Better spec information would have helped.
Find great deals on eBay for 4 inch air cleaner and 4.5 inch air cleaner. Shop with confidence.
From the Manufacturer You can improve the air quality in your home with Honeywell's whole-house air cleaner filters. Today's tightly-built homes trap dust, allergens ...
Honeywell 4-Inch High Efficiency Air Cleaning Filter 16x25x4"
You can improve the air quality in your home with Honeywell's whole-house air cleaner filters. Today's tightly-built homes trap dust, allergens and more, which ...
Honeywell-Honeywell CF100A1009 4-Inch High Efficiency Air Cleaning Filter 16x25x4"-CF100A1009-You can improve the air quality in your home with Honeywell's whole ...
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