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Air Filter Shield

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.

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Air Filters product list


Honeywell FC100A1052 12.5" x 20" Media Air Filter
(FC100A1052)

The Honeywell FC100A1052 12.5" x 20" Replacement Air Filter boasts an upgraded MERV 11 rating (based on ASHRAE Standard 52.2) and is used with the Honeywell Enviracaire F27F1032 Air Cleaner.


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Honeywell FC100A1052 12.5" x 20" Media Air Filter
As Low As: $27.00
Retail: $49.02
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Lennox X7935 MERV 16 Filter Media Replacement
(X7935)

The Lennox X7935 MERV 16 Filter Media Replacement is a replacement filter media for the Lennox HCC14-23 Healthy Climate True Fit Cabinet. Measuring approximately 20x20x5, this MERV 16 furnace filter box will trap at least 95% of particles.

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Lennox X7935 MERV 16 Filter Media Replacement
Our Price: $118.80
Retail: $149.95
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Lennox X0444 MERV 10 Pleated Furnace Filter Media
(X0444)

The Lennox X0444 MERV 10 Pleated Furnace Filter Media is a filter for your HVAC system. This furnace filter media is known as the x0444 and uses a MERV 10 air filter.The MERV 10 rating will provide your home with significant air cleaning capability


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Lennox X0444 MERV 10 Pleated Furnace Filter Media
Our Price: $28.95
Retail: $39.99
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Trane Perfect Fit BAYFTFR24M Compat. 24.5x27x5 2pk
(FFC24265TRN)

These MERV 11 Furnace Filters are compatible upgrades over Trane Perfect Fit Air Filters. These Filters Fast Air Filters specifically replace Trane part number BAYFTFR24M, which is a 24.5x27x5 Air Filter used in several Trane Air Cleaner models.


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Trane Perfect Fit BAYFTFR24M Compat. 24.5x27x5 2pk
Our Price: $98.00
Retail: $111.00
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FC40R1830 18x30 Honeywell Return Grille AC Filter
(FC40R1830)

The Honeywell FC40R1830 18x30 Return Air Grille Filter is a high efficiency, replacement air filter for return grille applications. Honeywell replacement furnace filters capture airborne particles that circulate through the furnace filter.


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FC40R1830 18x30 Honeywell Return Grille AC Filter
Our Price: $41.50
Retail: $68.00
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Trane Perfect Fit BAYFTFR21M Compat. 21x27x5 2pk
(FFC21275TRNM11)

These MERV 11 Furnace Filters are compatible upgrades over Trane Perfect Fit Air Filters. These Filters Fast Air Filters specifically replace Trane part number BAYFTFR21M or FLR06070, which is a 21x27x5 Air Filter used in several Trane Air Cleaners


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Trane Perfect Fit BAYFTFR21M Compat. 21x27x5 2pk
Our Price: $99.00

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Trane Perfect Fit BAYFTAH23M Compat. 21x23.5x5 2pk
(FFC21235TRN)

These MERV 11 Furnace Filters are compatible upgrades over Trane Perfect Fit Air Filters. These Filters Fast Air Filters specifically replace Trane part number BAYFTAH23M or FLR06073, which is a 21x23.5x5 Air Filter used in several Trane Air Cleaner.


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Trane Perfect Fit BAYFTAH23M Compat. 21x23.5x5 2pk
Our Price: $98.00

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Trane Perfect Fit BAYFTAH21M Compat. 21.5x21x5 2pk
(FFC215215TRN)

These MERV 11 Furnace Filters are compatible upgrades over Trane Perfect Fit Air Filters. These Filters Fast Air Filters specifically replace Trane part number BAYFTAH21M or FLR06072, which is a 21.5x21x5 Air Filter used in several Trane Air Cleaners


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Trane Perfect Fit BAYFTAH21M Compat. 21.5x21x5 2pk
Our Price: $98.00

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Trane BAYFTAH26P4A Pleated 1 inch Filter 26x21x1
(BAYFTAH26P4A)

The Trane BAYFTAH26P4A Pleated 1 inch Filter 26x21x1 is a furnace air filter that fits several electronic and media air cleaner models from Trane. This Trane air filter boasts a MERV 8 rating for the reduction of particulates in your air, including


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Trane BAYFTAH26P4A Pleated 1 inch Filter 26x21x1
Our Price: $12.95
Retail: $14.95
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Trane 21x23x5 Perfect Fit BAYFTAH23M Filter 2pk
(FFC21235TRNM8)

For an economical alternative to the genuine OEM Trane 21x23x5 Perfect Fit BAYFTAH23M Filter, try this compatible Trane MERV 8 21x23x5 Perfect Fit BAYFTAH23M Filter.


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Trane 21x23x5 Perfect Fit BAYFTAH23M Filter 2pk
Our Price: $65.00
Retail: $70.00
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Trane 21x26x5 Perfect Fit Filter BAYFTAH26M M13 x2
(FFC26215TRNM13)

If you are looking for an economical compatible version of the genuine Trane/American Standard BAYFTAH26M Perfect Fit Air Filter, try this Trane 21x26x5 Perfect Fit Filter BAYFTAH26M with a MERV 13 energy efficiency rating.

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Trane 21x26x5 Perfect Fit Filter BAYFTAH26M M13 x2
Our Price: $110.00
Retail: $140.00
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Honeywell 203369 Pre-Filter 12.5x20x.375 2-Pack
(203369)

The Honeywell 203369 Pre-Filter 12.5x20x.375 2-Pack is a replacement pre-filter for the Honeywell model F50 and F300 air cleaners. This Honeywell air filter traps larger particles in your air to help improve your overall indoor air quality and incre


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Honeywell 203369 Pre-Filter 12.5x20x.375 2-Pack
Our Price: $43.31
Retail: $49.99
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Honeywell HRF-AP1 Carbon PreFilter 2-Pack
(HRF-AP1 1 R)

The Honeywell HRF-AP1 Carbon PreFilter 2-Pack is a replacement carbon pre-filter for all models of Honeywell Round Air, Honeywell Quietcare, and Honeywell SilentComfort air purifiers. This two pack of carbon filters is cut-to-fit, reduces common odo


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Honeywell HRF-AP1 Carbon PreFilter 2-Pack
Our Price: $17.99
Retail: $19.99
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General Aire 16x20 MERV10 Filter Media GA100A03
(4350)

The GeneralAire GA100A03 16x20 MERV10 Filter Media is used on Honeywell F25 Series, F35 Series, F100 Series & F150 Series Media Style Air Cleaners, as well as Honeywell FC100A1003, F100F1004, F100B1008, F100F2028, and F150E1000 Air Cleaners.


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General Aire 16x20 MERV10 Filter Media GA100A03
Our Price: $19.99
Retail: $29.99
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Holmes HAPF30D Replacement HEPA Filter (2 Pack)
(HAPF30D)

The Holmes HAPF30D Replacement HEPA Filter (2 Pack) removes up to 99% of airborne dust and pollen, in addition to reducing pet dander, smoke and mold spores. Arm and Hammer baking soda is used in the filter to absorb and eliminate household odors.


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Holmes HAPF30D Replacement HEPA Filter (2 Pack)
Our Price: $51.23
Retail: $59.99
You Save 15%!

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Honeywell 20x20x5 Filter FC100A1011 - MERV 13 2pk
(FFC20205HONM13)

The Honeywell 20x20x5 Filter FC100A1011 is a compatible version of the genuine Honeywell FC100A1011 20"x20" Media AC Filter. This filter replacement is also known as part number FFC20205HONM13.


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Honeywell 20x20x5 Filter FC100A1011 - MERV 13 2pk
Our Price: $79.99
Retail: $90.00
You Save 11%!

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Honeywell 203371 Air Cleaner Pre-Filter 2-PACK
(203371)

The Honeywell 203371 is the correct replacement for the following air cleaners: Honeywell F300E1019 Honeywell F58A1001 Honeywell F58E1002 Honeywell F50F1073 Honeywell F58F1018 Honeywell F50E1158 Honeywell F50E1174 Honeywell F50E1281 Honey


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Honeywell 203371 Air Cleaner Pre-Filter 2-PACK
Our Price: $55.59
Retail: $59.99
You Save 7%!

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Trane Perfect Fit BAYFTFR17P4A Filter-17.5x27x1
(BAYFTFR17P4A)

The Trane Perfect Fit BAYFTFR17P4A Filter - 17.5x27x1 fits several air cleaner models manufactured by Trane. This Trane Perfect Fit filter is 1 inch and pleated for maximum purification of your air. This Trane furnace filter measures approximately 1


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Trane Perfect Fit BAYFTFR17P4A Filter-17.5x27x1
Our Price: $16.52
Retail: $19.99
You Save 17%!

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Lennox X0584 MERV 10 Pleated Media Filter
(X0584)

The Lennox X0584 MERV 10 Pleated Media Filter is a pleated air filter that replaces the filter media in the Lennox BMAC-14CE box media air cleaner and also fits inside Lennox the EAC012 and EAC0-14 model air cleaner cabinets in place of its electron


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Lennox X0584 MERV 10 Pleated Media Filter
Our Price: $27.00
Retail: $81.70
You Save 67%!

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Lennox X1152 MERV 10 Pleated Media Furnace Filter
(X1152)

The Lennox X1152 MERV 10 Pleated Media Furnace Filter is the replacement filter cartridge for several Lennox, Trion Air Bear, other air cleaner systems requiring 20x25x5 furnace filters.


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Lennox X1152 MERV 10 Pleated Media Furnace Filter
Our Price: $27.35
Retail: $29.75
You Save 8%!

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Trane Perfect Fit Filter 26x21x5 BAYFTAH26M 3 Pack
(HTRN2621T1)

These Honeywell air filters are compatible furnace filters that can be used as upgrades over the Trane Perfect Fit filter of the same size. Genuine Trane Perfect Fit filters have only a MERV 8 rating, while these compatible Honeywell furnace filters

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In stock! Ships in 1 business day.
Trane Perfect Fit Filter 26x21x5 BAYFTAH26M 3 Pack
Our Price: $139.50
Retail: $150.00
You Save 7%!

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Trane Perfect Fit BAYFTFR21M2A Filter-21x27x5
(BAYFTFR21M2A)

The Trane Perfect Fit BAYFTFR21M2A Filter Kit- 21x27x5 features a MERV 8 rating for the reduction of dust, dirt, and various allergens in your air, and the improvement of indoor air quality. This Trane air filter measures approximately 21" x 27" x 5


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Trane Perfect Fit BAYFTFR21M2A Filter-21x27x5
Our Price: $45.39
Retail: $49.99
You Save 9%!

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Lennox X8348 MERV 10 Filter Maintenance Kit
(X8348)

The Lennox X8348 MERV 10 Filter Maintenance Kit is a maintenance kit for the Lennox PCO-20C PureAir Air Purification System. This PureAir maintenance kit includes: one MERV 10 filter, also known as part number X6667; one catalyst insert, also known

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Lennox X8348 MERV 10 Filter Maintenance Kit
Our Price: $224.30
Retail: $254.95
You Save 12%!

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Honeywell FC40R1128 - Return Grille Filter 14x24
(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


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Honeywell FC40R1128 - Return Grille Filter 14x24
Our Price: $27.57
Retail: $29.99
You Save 8%!

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Trion 16x25x3 Air Bear Cub Filter - MERV 8 3pk
(FFC16253TABM8)

The Trion 16x25x3 Air Bear Cub Filter is an odor ban compatible MERV 8 filter replacement. This Air Bear Cub Filter is also known as part number FFC16253TABM8.


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Trion 16x25x3 Air Bear Cub Filter - MERV 8 3pk
Our Price: $39.99
Retail: $59.99
You Save 33%!

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Filters Fast - Air Filters

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