Pleated Filter
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 Nordic Pure 20x20x5L2M12 Lennox X7935 Replacement 12 Pleated Furnace Air Filter $9.99 Time Remaining: 7h 36m |
 12 X 12 X 1 MERV 8 Pleated Filter $22.88 Time Remaining: 25d 14h 13m Buy It Now for only: $22.88 |
 18 X 25 X 1 MERV 11 Pleated Filter $37.88 Time Remaining: 19d 14h 53m Buy It Now for only: $37.88 |
 16 X 16 X 1 MERV 11 Pleated Filter $27.88 Time Remaining: 12d 10h 28m Buy It Now for only: $27.88 |
 10 X 20 X 2 MERV 8 Pleated Filter $33.88 Time Remaining: 18d 14h 8m Buy It Now for only: $33.88 |
 20 X 20 X 1 MERV 13 Pleated Filter $36.88 Time Remaining: 20d 9h 53m Buy It Now for only: $36.88 |
 16 X 25 X 1 MERV 11 Pleated Filter $26.88 Time Remaining: 2d 9h 8m Buy It Now for only: $26.88 |
 14 X 24 X 1 MERV 11 Pleated Filter $35.88 Time Remaining: 15d 11h 48m Buy It Now for only: $35.88 |
 20 X 25 X 1 MERV 11 Pleated Filter $28.88 Time Remaining: 12d 11h 28m Buy It Now for only: $28.88 |
 20 X 30 X 1 MERV 8 Pleated Filter $40.88 Time Remaining: 6d 14h 8m Buy It Now for only: $40.88 |
 Spacegard Aprilaire 2400 Filter Pleat Spacer $3.33 Time Remaining: 1d 1h 3m |
 MERV 8 16x25x4 Pleated Furnace Filters A C 6 pack $63.35 Time Remaining: 20d 1h 32m Buy It Now for only: $63.35 |
 12 X 24 X 1 MERV 8 Pleated Filter $28.88 Time Remaining: 21d 11h 33m Buy It Now for only: $28.88 |
 20 X 20 X 1 MERV 11 Pleated Filter $26.88 Time Remaining: 14d 11h 8m Buy It Now for only: $26.88 |
 18 X 18 X 1 MERV 11 Pleated Filter $29.88 Time Remaining: 12d 10h 28m Buy It Now for only: $29.88 |
 12 PACK QUALITY MERV 13 FURNACE AC PLEATED AIR FILTERS $82.00 Time Remaining: 3d 22h 53m Buy It Now for only: $82.00 |
 Air Guard 16 X 25 X 2 DP 40 Max Pleated Filter 12 Pk $67.88 Time Remaining: 11d 11h 8m Buy It Now for only: $67.88 |
 Flanders 8155501142 14x20x1 Merv 6 Pleated Filter 1 case of 12 $25.00 Time Remaining: 3d 19h 1m Buy It Now for only: $25.00 |
 12 GF HIGH QUALITY AIR FILTERS MERV 11 MANY SIZES HERE $76.03 Time Remaining: 21d 12h 43m Buy It Now for only: $76.03 |
 Spacegard Aprilaire 2400 Filter Pleat Spacer $3.33 Time Remaining: 1d 1h 5m |
 20 X 20 X 1 MERV 8 Pleated Filter $24.88 Time Remaining: 18d 11h 48m Buy It Now for only: $24.88 |
 12 X 18 X 1 MERV 13 Pleated Filter $34.88 Time Remaining: 28d 14h 28m Buy It Now for only: $34.88 |
 Air Guard 16 X 20 X 4 DP 40 Max Pleated Filter 6 Pk $60.88 Time Remaining: 18d 10h 48m Buy It Now for only: $60.88 |
 14 X 20 X 1 MERV 13 Pleated Filter $34.88 Time Remaining: 26d 11h 53m Buy It Now for only: $34.88 |
 16 X 22 X 1 MERV 8 Pleated Filter $45.88 Time Remaining: 29d 14h 8m Buy It Now for only: $45.88 |
 16x25x4 MERV 12 Pleated AC Air Furnace Filters Qty 2 $36.80 Time Remaining: 29d 4h 17m Buy It Now for only: $36.80 |
 16 X 20 X 2 MERV 8 Pleated Filter $30.88 Time Remaining: 18d 10h 8m Buy It Now for only: $30.88 |
 14x14x1 Pleated Air Filter Merv 8 Box of 6 $49.59 Time Remaining: 23d 3h 25m Buy It Now for only: $49.59 |
 20 X 25 X 1 MERV 8 Pleated Filter $25.88 Time Remaining: 18d 11h 48m Buy It Now for only: $25.88 |
 Spacegard Aprilaire 2400 Filter Pleat Spacer $3.33 Time Remaining: 1d 1h 5m |
 14 X 14 X 1 MERV 13 Pleated Filter $40.88 Time Remaining: 21d 9h 53m Buy It Now for only: $40.88 |
 12 X 12 X 1 MERV 13 Pleated Filter $28.88 Time Remaining: 20d 12h 7m Buy It Now for only: $28.88 |
 Honeywell POPUP2025 Pleated Filter Media 20x25x5 $37.88 Time Remaining: 6d 13h 45m Buy It Now for only: $37.88 |
 12 X 12 X 1 MERV 11 Pleated Filter $26.88 Time Remaining: 24d 10h 53m Buy It Now for only: $26.88 |
 Air Guard 20 X 25 X 4 DP 40 Max Pleated Filter 6 Pk $80.88 Time Remaining: 13d 9h 28m Buy It Now for only: $80.88 |
 20 X 25 X 1 MERV 13 Pleated Filter $40.88 Time Remaining: 20d 14h 53m Buy It Now for only: $40.88 |
 14 X 24 X 1 MERV 13 Pleated Filter $41.88 Time Remaining: 9d 10h 28m Buy It Now for only: $41.88 |
 24 X 24 X 1 MERV 11 Pleated Filter $36.88 Time Remaining: 17d 9h 48m Buy It Now for only: $36.88 |
 6 Airflow Furnace Filters 16x20x1 Pleated MERV 8 $48.00 Time Remaining: 2d 20h 4m |
 14x24x1 MERV 8 Pleated AC Air Furnace Filters Qty 6 $39.54 Time Remaining: 6d 1h 59m Buy It Now for only: $39.54 |
 16 X 20 X 1 MERV 11 Pleated Filter $24.88 Time Remaining: 11d 14h 28m Buy It Now for only: $24.88 |
 15 X 20 X 1 MERV 8 Pleated Filter $28.88 Time Remaining: 27d 10h 8m Buy It Now for only: $28.88 |
 18 X 18 X 1 MERV 13 Pleated Filter $42.88 Time Remaining: 20d 10h 53m Buy It Now for only: $42.88 |
 20 X 30 X 1 MERV 11 Pleated Filter $43.88 Time Remaining: 9d 14h 28m Buy It Now for only: $43.88 |
 18 X 25 X 1 MERV 13 Pleated Filter $46.88 Time Remaining: 15d 14h 48m Buy It Now for only: $46.88 |
 18 X 24 X 1 MERV 13 Pleated Filter $45.88 Time Remaining: 1d 14h 28m Buy It Now for only: $45.88 |
 16 X 25 X 1 MERV 13 Pleated Filter $36.88 Time Remaining: 26d 14h 53m Buy It Now for only: $36.88 |
 PUOLATOR Pre Pleat 40 LPD Filters MERV 8 11 pack 16x25x2 $19.99 Time Remaining: 3d 2h 56m |
 10 X 20 X 1 MERV 11 Pleated Filter $24.88 Time Remaining: 29d 14h 8m Buy It Now for only: $24.88 |
 20 X 20 X 2 MERV 8 Pleated Filter $33.88 Time Remaining: 25d 12h 8m Buy It Now for only: $33.88 |
 MERV 11 20x22x1 Pleated Furnace Filters A C 12 pack $68.27 Time Remaining: 19d 20h 49m Buy It Now for only: $68.27 |
 14 X 30 X 1 MERV 11 Pleated Filter $44.88 Time Remaining: 12d 10h 28m Buy It Now for only: $44.88 |
 14 X 20 X 1 MERV 11 Pleated Filter $26.88 Time Remaining: 12d 9h 28m Buy It Now for only: $26.88 |
 Air Guard 20 X 20 X 4 DP 40 Max Pleated Filter 6 Pk $70.88 Time Remaining: 27d 11h 33m Buy It Now for only: $70.88 |
 6 PK 20X25X4 16X25X4 20X20X4 MERV 11 HOME FURNACE PLEATED AIR FILTERS GLASFLOSS $74.99 Time Remaining: 3d 23h 38m Buy It Now for only: $74.99 |
 14 X 30 X 1 MERV 13 Pleated Filter $59.88 Time Remaining: 20d 10h 53m Buy It Now for only: $59.88 |
 16 X 25 X 1 MERV 8 Pleated Filter $23.88 Time Remaining: 14d 9h 28m Buy It Now for only: $23.88 |
 20x20x1 Pleated House Home Air Filter Merv 8 Box of 12 $0.99 Time Remaining: 5d 21h 58m Buy It Now for only: $39.99 |
 20 X 25 X 2 MERV 8 Pleated Filter $35.88 Time Remaining: 18d 13h 8m Buy It Now for only: $35.88 |
 20x20x1 Pleated House Home Air Filter Merv 8 Box of 12 $39.99 Time Remaining: 4d 22h 24m Buy It Now for only: $39.99 |
 24 X 30 X 1 MERV 13 Pleated Filter $59.88 Time Remaining: 15d 10h 48m Buy It Now for only: $59.88 |
 10 X 20 X 1 MERV 8 Pleated Filter $22.88 Time Remaining: 20d 9h 33m Buy It Now for only: $22.88 |
 16x20x1 Furnace Filters Pleated Merv 8 Case of 12 Top Quality Heavy Duty $41.44 Time Remaining: 27d 23h 11m Buy It Now for only: $41.44 |
 16 X 20 X 4 MERV 13 Pleated Filter $104.88 Time Remaining: 27d 1h 53m Buy It Now for only: $104.88 |
 16 X 18 X 1 MERV 13 Pleated Filter $50.88 Time Remaining: 25d 14h 13m Buy It Now for only: $50.88 |
 QUAL MERV 13 PLEATED HOME FURNACE ALLERGY AIR FILTERS $73.00 Time Remaining: 6d 2h 29m Buy It Now for only: $73.00 |
 INDIGO FURNACE FILTER 16X25X2 inch PLEATED MESH RE ENFORCED $3.45 Time Remaining: 3d 6h 51m Buy It Now for only: $9.00 |
 Air Guard 20 X 24 X 4 DP 40 Max Pleated Filter 6 Pk $73.88 Time Remaining: 18d 14h 48m Buy It Now for only: $73.88 |
 16x25x4 MERV 8 Pleated Filters 2 Pack $37.98 Time Remaining: 10d 19h 21m Buy It Now for only: $37.98 |
 20 X 24 X 4 MERV 13 Pleated Filter $106.88 Time Remaining: 27d 1h 48m Buy It Now for only: $106.88 |
 16 X 25 X 1 Carbon Pleated Filter $66.88 Time Remaining: 21d 14h 53m Buy It Now for only: $66.88 |
 20 X 24 X 1 MERV 13 Pleated Filter $47.88 Time Remaining: 20d 14h 53m Buy It Now for only: $47.88 |
 20 X 25 X 2 Carbon Pleated Filter $100.88 Time Remaining: 21d 14h 53m Buy It Now for only: $100.88 |
 16 X 24 X 1 Carbon Pleated Filter $72.88 Time Remaining: 25d 14h 13m Buy It Now for only: $72.88 |
 AIR HANDLER 5W511 20x20x1 MERV7 Pleated Air Filters 1 case of 12 $29.00 Time Remaining: 29d 22h 1m Buy It Now for only: $29.00 |
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Culligan R50-BBSA Level 1 50 Micron Heavy Duty Sediment Replacement Cartridge
List Price:  |
DescriptionJumbo Heavy Duty Whole House Sediment Water Filter Replacement Cartridge, Filters Scale, Rust Particles, Coarse Sand, Filter Life 6 Months, 50 Micron Rating, Pleated Polyester Cartridge, Use Replacement Filter Model #HD-950 True Value #852-574. |
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Culligan S1A Level 2 20 Micron Sediment Replacement Cartridge 2 Pack
List Price: |
DescriptionS1 A replacement sediment filter cartridge removes dirt, sand, silt, rust, and scale particles. 20 micron (nominal) filtration. Pleated cellulose construction for increased surface areas and strength. Filter life up to 3 months or 12,000 gallon... |
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Culligan CP5-BBS Level 4 Heavy Duty Sediment Replacement Cartridge
List Price: |
DescriptionHeavy Duty Whole House Sediment Water Filter Replacement Cartridge, Filters Scale, Rust Particles, Sand, Dirt, and Silt, Filter Life 3 Months, 5 Micron Rating, Pleated Cellulose Polyester Cartridge, Replacement Filter For Model #HD-950... |
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Frigidaire FRA052XT7 5,000-BTU Mini Window Air Conditioner
List Price: |
DescriptionFrigidaire FRA052XT7 5,000 BTU Mini Window Air Conditioner |
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Frigidaire FRA054XT7 5,000 BTU Window-Mounted Mini Room Air Conditioner
Sale Price: $156.94 |
DescriptionFrigidaire's FRA054XT7 Energy Star 5,000 BTU 115-Volt Window-Mounted Mini-Compact Air Conditioner is perfect for rooms up to 165 sq ft. It quickly cools the room on hot days and quiet operation keeps you cool without keeping you awake... |
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DISPOSABLE EARLOOP FACE MASK BLUE 50/BX
List Price: |
DescriptionUNIQUELY DESIGNED, EXTRA-SOFT EAR LOOPS ELIMINATE PRESSURE TO THE EARS. SENSITIVE, INNER LAYER MADE OF SOFT FACIAL TISSUE, NO DYE, NO CHEMICAL, GENTLE TO THE SKIN. HIGH FILTRATION, BFE 99.5, PFE 99.7% AT 0... |
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Dynarex Earloop Procedure Masks, Glass-Free Filter, Blue
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Mr. Coffee Basket Coffee Filters, 4 Cup, White Paper, 100-Count Boxes (Pack of 12)
List Price: |
DescriptionMake sure you keep an extra box on hand. After all, a morning without coffee is sure to get your day off on the wrong foot. |
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K&N RE-0960 Universal Rubber Filter
List Price: |
DescriptionK & N AIR FILTER REP A-CHGR BK |
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AEM 21-204BF 3.5" x 5" DryFlow Air Filter
List Price: |
DescriptionA Brute Force Dryflow Air Filter from AEM is reusable, easily cleaned, and traps the most minute particles before they can enter your intake. All with great air flow for better horsepower and mileage!Cleanable And ReusableEliminates Warranty IssuesTrue Hard-Core Performance FilterBullet Proof ConstructionTraps More Dirt And Smaller ParticlesLifetime Reusable Element |
Air Filters-A Healthy HVAC System and Indoor Air
The filter in your HVAC system has two jobs. It stops undesired particles from entering the ductwork and passing over the internal components, namely the coils. The second job is to clean the air by removing dust and airborne particles which improves the indoor air quality. Modern buildings are constructed to minimize natural ventilation because they seal all the construction cracks and gaps. Have you noticed a lot of dust in your house or office? Maybe smells and odors linger longer than you want them to? Let's talk filters.
Filter Ratings
Any filter you buy will have something called a MERV Rating. MERV stands for Minimum Efficiency Reporting Values. The MERV rating is an industry-standard system for rating the minimum efficiency of air filters. The MERV rating is a scale from 1 to 20, with 1 being the least effective designation and 20 the most effective. A very economical fiberglass filter would have a MERV rating of 3 or 4, and only traps the largest of airborne particles which generally is bad for the HVAC system and the indoor air quality. A more efficient filter with a MERV rating of 20 will trap almost all particles. As the MERV rating increases, so does the filter effectiveness. If you're into the more formal definition, here you go:
MERV 20 Particle Size Filtered = < 0.3 microns Used in Industrial Cleanrooms
MERV 16 Particle Size Filtered = 0.3 - 1.0 microns Used in Operating Rooms
MERV 12 Particle Size Filtered = 1.0 - 3.0 microns Used in High Performance Residential
MERV 8 Particle Size Filtered = 3.0 - 10.0 microns Used in Average Commercial
MERV 4 Particle Size Filtered = >10.0 microns Filters out small rocks
Residential Filters
Most home HVAC systems tend to use the lower end filters, MERV 4 or so. While these are the most economical, they actually do little more than stop pollen, dust mites and carpet fibers. Perhaps you have noticed dust accumulating on the horizontal surfaces of your home. Unless you keep your windows open a lot, the dust is a side effect of poor HVAC filtration. If you want to reduce the amount of dust, step up to a MERV 10 or so.
An easy way to pick your filter is by knowing what you want to filter out of the air. Some examples are:
*MERV 5 to 6 - Lint & Heavy Dust Particles
*MERV 8 or 10 - Settling/Average Dust Particles, Mold Spores, Dust Mite Debris, Pet Dander, Pollen
*MERV 11 - Suspended/Fine Dust Particles, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Emissions
*MERV 12 - Suspended/Fine Dust Particles, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Emissions, Bacteria
*MERV 13 - Suspended/Fine Dust Particles, Mold Spores, Dust Mite Debris, Pet Dander, Pollen, Auto Emissions, Bacteria, Sub-Pollen Particles, Pollution, Most Viruses
Resist the temptation to upgrade your filter beyond MERV 12. The supply fan for your HVAC system may not be able to overcome the resistance (pressure drop) these filters require. Remember that the resistance of the filter will steadily increase as it gets dirty which will decrease your systems air flow. A good test is to measure the air temperature at one of the supply registers before you upgrade the filter. Then remove the filter and measure the temperature while there is no filter installed. Compare it to the first measurement. The two temperatures should be very close. The last part of the test is to measure the temperature after installing your new filter. If there is a change beyond 3 degrees, you will want to monitor the HVAC systems performance and note if it still heats or cools your home adequately.
Types of Filters
The size of the fan in your HVAC system determines the optimum filter type you can install. The proper filter for your furnace will maximize the particles removed from the air and minimize the loss of efficiency. Below are the most popular types of air filters and a brief description.
* HEPA Filter: Normally not used in residential applications due to the pressure drop, HEPA filters are among the most efficient filters on the market. They operate at an efficiency rate of over 99 percent and remove almost all of the bacteria, most tobacco smoke, cooking oil and sneeze droplets in the air.
* Charcoal Air Filter: This is a filter with carbon deposited inside the filtering media. Also known as activated carbon filter. Charcoal filters are ideal for the removal of odors caused by tobacco smoke, chemicals, and gases.
* Pleated Filter: The pleated filter is the best filter for most residential applications. It is a good option for efficiently removing particles from the air. The filter material is pleated, or folded, in order to increase its overall surface area and consequently trap more particles. The pleats will also increase the life of the filter.
* Electrostatic/Electronic Filter: Electrostatic filters are typically provided as an upgrade when you purchase a new air handling unit. They are a great way to improve air quality without decreasing the efficiency of your fan. Basically an electrostatic field is produced across the filter which attracts airborne particles. This is similar to the bug zapper you might have in your back yard. Since the filter material is relatively thin, airflow reduction caused by electrostatic filters is minimal.
* Bag Filters: This type of filter is not used in residential applications. It is installed in a rack which houses multiple bags of filter media. The bags come in various MERV ratings which makes this a good choice for hospitals or high-end commercial applications.
Value Added Features
You can also find filters with baking soda (Arm & Hammer), antimicrobial properties, pre-filter pad or odor control properties. While these features do not effect the MERV rating, they can be used to enhance the filter's effectiveness.
About the Author
I am a professional engineer with over 30 years of design experience relating to plumbing and mechanical systems. Visit the Pro Energy & HVAC site.