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While many people worry about outdoor air quality, statistics show that they actually should be more concerned about indoor air quality (IAQ). IAQ is the measure of harmful pollutants discovered within or around your home. The EPA ranks IAQ as one of the top five public health risks.

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Air Filter FAQ

Can I use the same air filter for both heat and AC?

Yes, both AC filters and furnace filters are the same thing. We categorize filters based on their intended use to make filter shopping easier for the customer. During the summer months you are more likely to search for AC filters. While during colder winter months you are looking to buy furnace filters. A good tip for remembering when to change your filters is to replace them at the start of each new season.

Which direction does the air filter go?

Always point the arrow on the box in the direction of airflow. If you are unsure the direction of airflow turn on the system fan. Do not remove the old filter before checking airflow as this might allow dirt or debris to escape.

What is air filter MERV rating?

The Minimum Efficiency Reporting Value (MERV) is used by manufacturers to explain how efficent the air filter is at trapping airborne particles. A higher MERV rating means cleaner air but reduced air flow. MERV 8 filters capture 80% of airborn particles like pollen, dust mites, mold spores, and pet dander down to 3 microns in size. MERV 11 air filters capture up to 95% of the above mentioned airborne particles down to 1 micron in size. If you choose a MERV 13 filter expect greatly diminished airflow but improved filtration of bacteria, tobacco smoke, and cooking oil down to 0.3 micorn in size. Before you choose a MERV rating check with your HVAC manufacturer to see what your system is designed to handle. Picking the wrong filter can impact air flow and reduce equipment life.

When to change the air filter in your house?

Replace your air filters every 3 months. You may need to replace your filters more frequently depending on air quality. If you are unsure about indoor air quailty check the filter monthly. If you notice the filter material is greatly discolored or noticably dirty change out the filter. Failing to replace air filters as recommened can lead to reduced system efficieny, greater energy costs, and poor air quailty.

Which air filter is best for allergies?

If you have respiratory problems caused by pollen, dust, mold, or pet dander a MERV 11 filter can help reduce the severity of aliments caused by allergies. If you are sensitive to smoke from cooking or tobacco a MERV 13 filter is recommend. For many allergy sufferers it is recommend you install filters to process both supply and return air. Before you choose a MERV rating check with your HVAC manufacturer to see what your system is designed to handle. Picking the wrong filter can impact air flow and reduce equipment life.

Which air filter is best for my home?

Your choice in air filter should depend on needs. MERV 8 filters are perfect if you have no pets and allergies are not a serious concern. MERV 11 filters are recommend for occasional allergy sufferers and homes with pets. A MERV 13 filter should be used if allergies are a serious concern and there are tobacco smokers in the house.

Where are they made?

Filtersfast brand air filters are proudly made in America. While the manufacturing location of products can vary from company-to-company, Country of Origin laws require that most products manufactured outside of America bear labeling that tells consumers where the product is made. This label should be visable on the product itself or the packaging in which it arrived.

Are the home air filters electrostatically charged?

Yes, Filtersfast, Filtrete, Carrier, among many other air filter brands use an electrostatically charged filter media. Fiberglass air filters are far less common today and were never designed to improve air quality, rather they protect HVAC systems from large dirt and debris.

Routine maintenance is a critical part of caring for your home. One area that should not be overlooked is replacing your home’s furnace filters on a regular basis following the manufacturers recommended guidelines. By doing this, you will help prolong the life of your system, as well as help eliminate indoor air contaminates.

Air filters help rid your home of a variety of air pollutants including smog, smoke, pollen, bacteria, pet dander, mold spores, dust, dust mites, debris and virus carrying particles. The MERV rating on furnace filters can help guide you in this area. The higher the rating, the more efficient the air filter will be at eliminating indoor contaminates.

Filtrete, Trion, 3M and Honeywell all manufacture high quality filters in a variety of sizes to meet all of your air filtration needs.


Furnace Filters full product list:


GeneralAire AC-1 Filter 20x24x5 MERV 13 (2 PACK)
(FFC20245GAM13)

The GeneralAire AC-1 Air Filter 20x24x5 is a cost-effective compatible version of the genuine 20x24x5 General Filter AC-1 Air Filters.


In Stock! Ships in 22 to 23 business days.
GeneralAire AC-1 Filter 20x24x5 MERV 13 (2 PACK)
Our Price: $61.00
Retail: $79.99
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GeneralAire AC-1 Filter 20x24x5 MERV 8 (2 PACK)
(FFC20245GAM8)

GeneralAire AC-1 Air Filter 20x24x5 is an economical alternative for the OEM GeneralAire AC-1 Air Filter 20x24x5. This furnace filter is part of the GeneralAire AC-1 Series of Residential Air Cleaner Replacement Filters.


In Stock! Ships in 3 to 4 business days.
GeneralAire AC-1 Filter 20x24x5 MERV 8 (2 PACK)
Our Price: $57.99
Retail: $79.99
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Trane 21x23.5x5 Perfect Fit BAYFTAH23M Filter 2pk
(FFC23205TRNM8)

For an economical compatible version of the genuine OEM Trane BAYFTAH23M 21x23.5x5 Perfect Fit Filter, try this MERV 8 Trane 21x23.5x5 Perfect Fit BAYFTAH23M replacement filter.


In Stock! Ships in 14 to 15 business days.
Trane 21x23.5x5 Perfect Fit BAYFTAH23M Filter 2pk
Our Price: $51.00
Retail: $69.99
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Baby's Room Vent Filter Kit
(VC-B)

The BestAir Baby's Room Vent Filter is a large 12" x 14" cut-to-fit, electrostatic and carbon filter that helps to reduce airborne pollutants such as pollen, dust, dirt, bacteria, mold spores, pet dander and hair.


In Stock! Ships in 9 to 10 business days.
Baby's Room Vent Filter Kit
Our Price: $6.99
Retail: $8.99
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FiltersFast MERV 8 Odor Killer 2" 6-Pack
(FFOKGM 2 INCH)

The FiltersFast MERV8 Odor Killer 2" 6-Pack is an effective replacement charcoal air filter to eliminate pet odors, gases, smoke odors, cigarette odors and other contaminants from your indoor air.


In Stock! Ships in 12 to 13 business days.
FiltersFast MERV 8 Odor Killer 2" 6-Pack
Our Price: $50.99
Retail: $99.99
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FiltersFast 4" MERV 8 Odor Killer Filter 6-Pack
(FFOKGM4 6PACK)

The FiltersFast 4" MERV 8 Odor Killer Filter 6-Pack is a set of replacement air filters that can eliminate common odors from your home or office, including pet odors, gaseous odors, and smoke and cigarette odors. These odor killer filters utilize G


In Stock! Ships in 10 to 11 business days.
FiltersFast 4" MERV 8 Odor Killer Filter 6-Pack
Our Price: $63.99
Retail: $75.99
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FiltersFast 5" Trion Compatible Air Filter 2-Pack
(FFC20255TAB OKGM)

The FiltersFast 5" Trion Compatible FFC20255TAB OKGM is a compatible air filter for Trion Air Bear Air Cleaners that can replace part numbers 255649-102, 229990-002, and 229990-102. This Trion compatible filter features a MERV 8 efficiency rating


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FiltersFast 5" Trion Compatible Air Filter 2-Pack
Our Price: $45.99
Retail: $54.99
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FiltersFast 5" WR Compatible FFC20265WR OKGM
(FFC20265WR OKGM)

The FiltersFast 5" WR Compatible FFC20265WR OKGM is a compatible replacement air filter that is an upgrade over the White Rodgers F825-0549 air filter. The FiltersFast FFC20265WR OKGM 20" x 26" x 5" air filter can be used in several White Rodgers A


In Stock! Ships in 37 to 38 business days.
FiltersFast 5" WR Compatible FFC20265WR OKGM
Our Price: $73.99
Retail: $87.99
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FiltersFast MERV 8 Trion Compatible Filter 2-Pack
(FFC16255TAB OKGM)

The FiltersFast MERV 8Trion Compatible Filter 3PACK is the correct replacement for the following: all Trion Air Bear cleaners requiring a 16" x 25" x 5" media filter cartridge This FiltersFast air filter has a MERV 8 rating. This means th


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FiltersFast MERV 8 Trion Compatible Filter 2-Pack
Our Price: $56.00
Retail: $82.99
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FiltersFast MERV 8 16x27x6 Air Filter 2-Pack
(FFC162766SG OKGM)

The FiltersFast MERV 8 16x27x6 Air Filter 2-Pack is a pack of replacement air filters that is an upgrade over the Aprilaire Space Gard 2400 AC Filter. This 16" x 27" 6" has a MERV 8 rating for the reduction of airborne pollutants like pollen, dir


In Stock! Ships in 12 to 13 business days.
FiltersFast MERV 8 16x27x6 Air Filter 2-Pack
Our Price: $46.00
Retail: $59.99
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FiltersFast Trane 21x23x5 Compatible Filter 2-Pack
(FFC21235TRN OKGM)

The FiltersFast 5" Trane Perfect Fit 21x23x5 Compatible FFC21235TRN OKGM is the correct replacement for the following: any air cleaner that requires a 21" x 23" x 5" filter This FiltersFast air filter also replaces Trane Perfect Fit BAYFTAH23

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In Stock! Ships in 12 to 13 business days.
FiltersFast Trane 21x23x5 Compatible Filter 2-Pack
Our Price: $99.00
Retail: $116.99
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FiltersFast 5" Trane BAYFTFR21M Compatible 2-Pack
(FFC21275TRN OKGM)

The FiltersFast 5" Trane Perfect Fit BAYFTFR21M Compatible FFC21275TRN OKGM fits the following: any air cleaner that calls for a 21" x 27" x 5" filter This FiltersFast air filter also replaces the Trane Perfect Fit BAYFTFR21M filter. This Tr

Free shipping within the continental United States!

In Stock! Ships in 3 to 4 business days.
FiltersFast 5" Trane BAYFTFR21M Compatible 2-Pack
Our Price: $100.00
Retail: $117.99
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FiltersFast 5" Trane BAYFTAH21M Compatible 2-Pack
(FFC215215TRN OKGM)

The FiltersFast 5" Trane PF BAYFTAH21M Compatible FFC215215TRN OKGM fits the following: Any air cleaner that requires a 21" x 21.5" x 5" filter This FiltersFast air filter also replaces the Trane Perfect Fit BAYFTAH21M filter. This air filte


In Stock! Ships in 3 to 4 business days.
FiltersFast 5" Trane BAYFTAH21M Compatible 2-Pack
Our Price: $50.90
Retail: $99.99
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FiltersFast 5" Trane BAYFTAH23M Compatible 2-Pack
(FFC23205TRN OKGM)

The FiltersFast 5" Trane PF BAYFTAH23M Compatible FFC23205TRN OKGM fits the following: any air cleaner that calls for a 20" x 23" x 5" filter This FiltersFast air filter also replaces the Trane Perfect Fit BAYFTAH23M filter. This Trane compa


In Stock! Ships in 3 to 4 business days.
FiltersFast 5" Trane BAYFTAH23M Compatible 2-Pack
Our Price: $67.66
Retail: $104.99
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FiltersFast 5" Trane BAYFTAH26M Compatible 2-Pack
(FFC26215TRN OKGM)

The FiltersFast 5" Trane PF BAYFTAH26M Compatible FFC26215TRN OKGM fits the following: Any air cleaner that requires a 26" x 21" x 5" filter This FiltersFast air filter is also compatible with the Trane Perfect Fit BAYFTAH26M air filter. Thi

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In Stock! Ships in 12 to 13 business days.
FiltersFast 5" Trane BAYFTAH26M Compatible 2-Pack
Our Price: $94.00
Retail: $110.99
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FiltersFast 20x20x5 Trion Compatible 2-Pack
(FFC20205TAB OKGM)

The FiltersFast 20x20x5 Trion Compatible Filter can be used Trion AirBear and other air cleaners requiring 20"x20"x5" filter cartridges. They remove airborne particles such as pollen, dust, dander, dust, and other allergens from your indoor air.


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FiltersFast 20x20x5 Trion Compatible 2-Pack
Our Price: $49.80
Retail: $94.99
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FiltersFast MERV 8 20x24x5 Air Filter 2-Pack
(FFC20245GA OKGM)

The FiltersFast MERV 8 20x24x5 Air Filter can be used on Generalaire AC-1, Carrier 31MF020100, Byrant 902BXX020, and air cleaners requiring a 20"x24"x5" filter. These effective air filters remove airborne particles to provide healthier indoor air.


In Stock! Ships in 3 to 4 business days.
FiltersFast MERV 8 20x24x5 Air Filter 2-Pack
Our Price: $49.25
Retail: $69.99
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FiltersFast FC100A1037 Compatible MERV 8 2-Pack
(FFC20255HON OKGM)

The FiltersFast FC100A1037 Compatible MERV 8 2-Pack is a compatible replacement air filter for the Honeywell FC100A1037 Air Filter. This two pack of FiltersFast air filters features a MERV 8 rating for the reduction of pollen, dust, pet dander,


In Stock! Ships in 14 to 15 business days.
FiltersFast FC100A1037 Compatible MERV 8 2-Pack
Our Price: $50.90
Retail: $94.99
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FiltersFast 15x20x5 MERV 13 Return Grille Filter
(FFRAG13-15205)

The FiltersFast 15x20x5 MERV 13 Return Grille Filter can be used in almost every air cleaner system requiring a 15"x20"x5" media filter cartridge and remove at least 90% of all particles 1.0-10.0 microns.


In Stock! Ships in 10 to 11 business days.
FiltersFast 15x20x5 MERV 13 Return Grille Filter
Our Price: $42.99
Retail: $50.99
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FiltersFast 14x24x5 MERV 8 Return Grille Filter
(FFRAGM8-14245)

The FiltersFast 14x24x5 MERV 8 Return Grille Filters, for most air cleaners using 14"x24"x5" filter media, can dramatically reduce airborne particles and allergens to produce healthier indoor air.


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FiltersFast 14x24x5 MERV 8 Return Grille Filter
Our Price: $40.99
Retail: $48.99
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FiltersFast 15x20x5 MERV 8 Return Grille Filter
(FFRAGM8-15205)

The FiltersFast FFRAGM8-15205 fits the following: Most air returns that require a 15" x 20" filter The FiltersFast 15x20x5 MERV 8 Return Grille Filter will reduce pollen, dust, pet dander, and other allergens from the air inside your home. T


In Stock! Ships in 10 to 11 business days.
FiltersFast 15x20x5 MERV 8 Return Grille Filter
Our Price: $39.99
Retail: $47.99
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FiltersFast 10x10x1 MERV 8 Filter 6-Pack
(FFOKGM 6-PACK-10101)

The FiltersFast FFOKGM 6-PACK-10101 can be used for most air cleaners requiring 10"x10"x1" filter cartridges. These filters will significantly reduce dust, pet dander, pollen, mildew, mold and other allergens from your indoor air.


In Stock! Ships in 18 to 19 business days.
FiltersFast 10x10x1 MERV 8 Filter 6-Pack
Our Price: $39.99
Retail: $49.99
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FiltersFast 12x12x1 MERV 8 Filter 6-Pack
(FFOKGM 6-PACK-12121)

The FiltersFast FFOKGM 6-PACK-12121 is an Odor Killer Grey Matter filter that works to remove the following from your indoor air: Smoke odors Cigarette odors Pet odors Gases Other contaminants Pollen Dust Pet Dander Mold Mildew Other


In Stock! Ships in 13 to 14 business days.
FiltersFast 12x12x1 MERV 8 Filter 6-Pack
Our Price: $39.99
Retail: $49.99
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Honeywell FC40R1128 - Return Grille Filter 14x24 5-Pack
(FC40R1128)

The Honeywell FC40R1128 is a return air grille filter that fits the following: Any return air grille that uses a 14 inch x 24 inch x 4 inch filter The Honeywell FC40R1128 - Return Grille Filter 14x24 has a Minimum Efficiency Reporting Value (M


In Stock! Ships in 9 to 10 business days.
Honeywell FC40R1128 - Return Grille Filter 14x24
Our Price: $147.85

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Honeywell FC40R1177 Return Grille Filter - 24x30 5-Pack
(FC40R1177)

The Honeywell FC40R1177 Return Grille Filter - 24x30 is a cartridge-style air filter that mounts in most return filter grilles. The Honeywell return air grille filter is constructed 4 inches thick for a higher efficiency than 1 inch filters. This Ho


In Stock! Ships in 3 to 4 business days.
Honeywell FC40R1177 Return Grille Filter - 24x30
Our Price: $209.75

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Filters Fast - Furnace Filters

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