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Find Replacement Air Filters Fast & Easy!

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.

Trane air filters should be replaced every year to maintain air quality and excellent furnace performance.


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Trane Furnace Filters product list


Trane Perfect Fit Compat. 17.5x27x5 2 pk, MERV 13
(FFC175275TRN M13)

These MERV 13 Furnace Filters replace Trane Perfect Fit Air Filters with the part number BAYFTFR17M or FLR06069, which are 17.5x27x5 air filters used in several Trane Air Cleaner models.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane Perfect Fit Compat. 17.5x27x5 2 pk, MERV 13
Our Price: $89.99
Retail: $116.99
You Save 23%!

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Trane BAYFTFR14M2 Replacement Air Filter 14.5x27x5
(BAYFTFR14M2)

The Trane BAYFTFR14M2 Replacement Air Filter 14.5x27x5 is a furnace air filter that fits the TFM145B0FR0 Perfect Fit High Efficiency Air Cleaner. This Trane Perfect Fit filter, also known as a furnace enclosure filter, is MERV 8 rated to purify your


In stock! Ships in 1 business day.
Trane BAYFTFR14M2 Replacement Air Filter 14.5x27x5
Our Price: $41.23
Retail: $49.99
You Save 18%!

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Trane Perfect Fit BAYFTFR21P4A Filter - 21x27x1
(BAYFTFR21P4A)

The Trane Perfect Fit BAYFTFR21P4A Filter - 21x27x1 fits several air cleaner models made by Trane. This Trane furnace filter measures approximately 21" x 27" x 1" and has pleats for the purification of your indoor air. This Trane Perfect Fit filter


In Stock! Ships in 1 to 2 business days.
Trane Perfect Fit BAYFTFR21P4A Filter - 21x27x1
Our Price: $19.90
Retail: $19.99
You Save 0%!

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Trane 24x26x5 Perfect Fit BAYFTFR24M Filter 2pk
(FFC24265TRNM8)

The Trane MERV 8 24x26x5 Perfect Fit BAYFTFR24M Filter is the compatible alternative of the genuine OEM 24x26x5 Trane Perfect Fit BAYFTFR24M Filter.


In Stock! Ships in 1 to 2 business days.
Trane 24x26x5 Perfect Fit BAYFTFR24M Filter 2pk
Our Price: $50.00
Retail: $70.00
You Save 29%!

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Trion 16x25x3 Air Bear Cub Filter - MERV 13 3pk
(FFC16253TABM13)

The 16x25x3 Trion Air Bear Cub Filter is a compatible version of the genuine Trion Air Bear Media AC Filter 16x25x3, 255649-101.


In Stock! Ships in 1 to 2 business days.
Trion 16x25x3 Air Bear Cub Filter - MERV 13 3pk
Our Price: $83.00
Retail: $100.00
You Save 17%!

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Trane Perfect Fit BAYFTAH23W1A Prefilter 23.5x21x1
(BAYFTAH23W1A)

The Trane Perfect Fit BAYFTAH23W1A Prefilter 23.5x21x1 is an OEM replacement filter from Trane that features a MERV 5 rating for the reduction of airborne particulates. This Trane Perfect Fit filter fits 23 1/2" enclosures and measures approximately


In stock! Ships in 1 business day.
Trane Perfect Fit BAYFTAH23W1A Prefilter 23.5x21x1
Our Price: $20.33
Retail: $29.99
You Save 32%!

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Trane 21.5x21x5 Perfect Fit Filter BAYFTAH21M M13
(FFC215215TRNM13)

The Trane 21.5x21x5 Perfect Fit Filter BAYFTAH21M is a compatible economical alternative for the genuine Trane 21.5x21x5 Perfect Fit Filter that comes in a 2-pack value set.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane 21.5x21x5 Perfect Fit Filter BAYFTAH21M M13
Our Price: $110.00
Retail: $140.00
You Save 21%!

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Trane BAYFTAH21P4A Pleated 1 inch Filter 21.5x21x1
(BAYFTAH21P4A)

The Trane BAYFTAH21P4A is an air conditioning and furnace filter for use in the following application: 21 1/2 inch enclosures The Trane BAYFTAH21P4A Pleated 1 inch Filter 21.5x21x1 is a 1 inch pleated filter. This Trane perfect fit filter meas


In Stock! Ships in 1 to 2 business days.
Trane BAYFTAH21P4A Pleated 1 inch Filter 21.5x21x1
Our Price: $11.83
Retail: $14.99
You Save 21%!

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Trane Perfect Fit BAYFTFR14P4A Filter - 14.5x27x1
(BAYFTFR14P4)

The Trane Perfect Fit BAYFTFR14P4A Filter - 14.5x27x1 is a furnace air filter that fits several air cleaner models from Trane. This Trane Perfect Fit filter features pleats that help capture a variety of airborne particles to purify your air. This T


Special Order. Ships in 46 days.
Trane Perfect Fit BAYFTFR14P4A Filter - 14.5x27x1
Our Price: $16.11
Retail: $19.99
You Save 19%!

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Trane Perfect Fit Filter 14.5x27x5 BAYFTFR14M 3-Pk
(HTRN1427T1)

These three 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 f

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane Perfect Fit Filter 14.5x27x5 BAYFTFR14M 3-Pk
Our Price: $120.00
Retail: $140.00
You Save 14%!

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Trane BAYFTAH26P4A Pleated 1 inch Filter 26x21x1 4-Pack
(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


Special Order. Ships in 23 days.
Trane BAYFTAH26P4A Pleated 1 inch Filter 26x21x1 4-Pack
Our Price: $51.80
Retail: $59.80
You Save 13%!

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Trane Perfect Fit BAYFTAH21W1A Prefilter 21.5x21x1
(BAYFTAH21W1A)

The Trane Perfect Fit BAYFTAH21W1A Prefilter 21.5x21x1 is an OEM replacement filter from Trane that features a MERV 5 rating for the reduction of airborne particulates. This Trane Perfect Fit filter fits 21 1/2" enclosures and measures approximately


In Stock! Ships in 1 to 2 business days.
Trane Perfect Fit BAYFTAH21W1A Prefilter 21.5x21x1
Our Price: $18.51
Retail: $19.99
You Save 7%!

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Filters Fast 5" Trane BAYFTFR21M Compatible 2-Pack
(FFC21275TRN OKGM)

The Filters Fast 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 Filters Fast air filter also replaces the Trane Perfect Fit BAYFTFR21M filter. This Tr


In Stock! Ships in 1 to 2 business days.
Filters Fast 5" Trane BAYFTFR21M Compatible 2-Pack
Our Price: $66.66
Retail: $104.99
You Save 37%!

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Trane 21x27x5 Perfect Fit Filter BAYFTFR21M M13 x2
(FFC21275TRNM13)

The Trane 21x27x5 Perfect Fit Filter BAYFTFR21M is an economical compatible version of the genuine Trane 21x27x5 Perfect Fit Air Filter.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane 21x27x5 Perfect Fit Filter BAYFTFR21M M13 x2
Our Price: $110.00
Retail: $140.00
You Save 21%!

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FiltersFast Trane 21x23x5 Compatible Filter 2-Pack
(FFC21235TRN OKGM)

The Filters Fast 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 Filters Fast air filter also replaces Trane Perfect Fit BAYFTAH23


In Stock! Ships in 10 to 11 business days.
FiltersFast Trane 21x23x5 Compatible Filter 2-Pack
Our Price: $42.99
Retail: $49.95
You Save 14%!

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Trane 24x26x5 Perfect Fit Filter BAYFTFR24M M13 x2
(FFC24265TRNM13)

For an economical compatible version of the genuine 24x26x5 Trane Perfect Fit BAYFTFR24M Filter, try this Trane 24x26x5 Perfect Fit Filter BAYFTFR24M with a MERV 13 energy efficiency rating.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane 24x26x5 Perfect Fit Filter BAYFTFR24M M13 x2
Our Price: $110.00
Retail: $140.00
You Save 21%!

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Trane Perfect Fit Filter 21x27x5 BAYFTFR21M 3-Pack
(HTRN2127T1)

These three 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 f

Free shipping within the continental United States!

In stock! Ships in 1 business day.
Trane Perfect Fit Filter 21x27x5 BAYFTFR21M 3-Pack
Our Price: $148.50
Retail: $160.00
You Save 7%!

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Trane Perfect Fit Filter 24x27x5 BAYFTFR24M 3-Pack
(HTRN2427T1)

These three 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 f

Free shipping within the continental United States!

In stock! Ships in 1 business day.
Trane Perfect Fit Filter 24x27x5 BAYFTFR24M 3-Pack
Our Price: $144.00
Retail: $160.00
You Save 10%!

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Trane Perfect Fit BAYFTFR24M2A Filter - 24.5x27x5
(BAYFTFR24M2A)

The Trane Perfect Fit BAYFTFR24M2A Filter - 24.5x27x5 fits the TFM245B0FR0 Perfect Fit High Efficiency Air Cleaner and easily slides in for quick use. This Trane Perfect Fit filter measures approximately 24.5" x 27" x 5" and has a MERV 8 rating for


In stock! Ships in 1 business day.
Trane Perfect Fit BAYFTFR24M2A Filter - 24.5x27x5
Our Price: $49.73
Retail: $59.99
You Save 17%!

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Trane Perfect Fit BAYFTFR21W1A Pre-filter 21x27x1
(BAYFTFR21W1A)

The Trane BAYFTFR21W1A is a pre-filter for use in the following furnace: Trane BAY21WF The Trane Perfect Fit BAYFTFR21W1A Pre-filter 21x27x1 has a nominal size of 21 inches x 27 inches x 1 inch. The actual size of this Trane pre-filter is 20.7


In stock! Ships in 1 business day.
Trane Perfect Fit BAYFTFR21W1A Pre-filter 21x27x1
Our Price: $49.99
Retail: $69.99
You Save 29%!

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FiltersFast 5" Trane BAYFTAH23M Compatible 2-Pack
(FFC23205TRN OKGM)

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


In Stock! Ships in 10 to 11 business days.
FiltersFast 5" Trane BAYFTAH23M Compatible 2-Pack
Our Price: $66.66
Retail: $104.99
You Save 37%!

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Trane Perfect Fit BAYFTFR14W1A Prefilter 14.5x27x1
(BAYFTFR14W1A)

The Trane Perfect Fit BAYFTFR14W1A Prefilter 14.5x27x1 is a washable filter with a MERV 5 rating that needs to be changed every 3 months for maximum efficiency. This Trane pre-filter includes two filters that measure approximately 12 7/8" X 14 1/4"


In stock! Ships in 1 business day.
Trane Perfect Fit BAYFTFR14W1A Prefilter 14.5x27x1
Our Price: $17.54
Retail: $19.99
You Save 12%!

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Trane 21x23x5 Perfect Fit Filter BAYFTAH23M M13 x2
(FFC21235TRNM13)

The Trane 21x23x5 Perfect Fit Filter BAYFTAH23M is a compatible version of the genuine Trane Perfect fit 21x23x5 Air Filter.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane 21x23x5 Perfect Fit Filter BAYFTAH23M M13 x2
Our Price: $110.00
Retail: $140.00
You Save 21%!

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Filters Fast 5" Trane BAYFTAH21M Compatible 2-Pack
(FFC215215TRN OKGM)

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


In Stock! Ships in 10 to 11 business days.
Filters Fast 5" Trane BAYFTAH21M Compatible 2-Pack
Our Price: $64.66
Retail: $99.99
You Save 35%!

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Trane Perfect Fit Filter 21.5x21x5 BAYFTAH21M 3-Pk
(HTRN2121T1)

These three 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 f

Free shipping within the continental United States!

In stock! Ships in 1 business day.
Trane Perfect Fit Filter 21.5x21x5 BAYFTAH21M 3-Pk
Our Price: $147.00
Retail: $150.00
You Save 2%!

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Filters Fast - Trane Furnace Filters

" Thank you for your expert service when helping me get the proper filters for my old pool and filter system. The new ones are perfect and work very well. All the best! " - Jim, Alamo, CA
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