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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:


3M Filtrete 600 MPR Pollen Air Filter (Green) 6-Pack
(Dust and Pollen 6-Pk)

The 3M Filtrete Dust & Pollen Furnace Filter is an electrostatically charged furnace filter ideal for high velocity HVAC systems. 3M Filtrete filters are an economical upgrade from cheap one month filters.


In stock! Ships in 1 business day.
3M Filtrete 600 MPR Pollen Air Filter (Green) 6-Pack
Our Price: $62.25
Retail: $73.99
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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


Special Order. Ships in 14 days.
Trane Perfect Fit BAYFTFR21P4A Filter - 21x27x1
Our Price: $21.90
Retail: $25.99
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GE WP85X10003 Air Conditioner Filter for Zoneline A/C (Left)
(WP85X10003)

This GE Air Conditioner Filter (WP85X10003) is a replacement filter for GE Zoneline air conditioning (A/C) units. This air conditioner filter fits in the left side panel slot only - the filter for the right side panel slot is sold separately.


Out of stock
GE WP85X10003 Air Conditioner Filter for Zoneline A/C (Left)
Our Price: $25.25
Retail: $29.99
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FilterFast FFC215215TRNM13 Replacement for Trane BAYFTAH21M, 21.5x21x5 Perfect Fit - MERV13, 2-Pack
(FFC215215TRNM13)

The FilterFast Brand Trane 21.5x21x5 Perfect Fit Filter BAYFTAH21M, FLR06072, BAYFTAH21M2 is a compatible economical alternative for the genuine Trane 21.5x21x5 Perfect Fit Filter that comes in a 2-pack value set.


In Stock! Ships in 3 to 4 business days.
FilterFast FFC215215TRNM13 Replacement for Trane BAYFTAH21M, 21.5x21x5 Perfect Fit - MERV13, 2-Pack
Our Price: $69.95
Retail: $139.99
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FiltersFast FFC20205HONM13 Replacement for Honeywell FC100A1011, 20x20x5 2-Pack
(FFC20205HONM13)

The FiltersFast Brand Honeywell 20x20x5 FC100A1011 2-Pack 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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FiltersFast FFC20205HONM13 Replacement for Honeywell FC100A1011, 20x20x5 2-Pack
Our Price: $80.99
Retail: $95.99
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Honeywell FC200E1011 Media Filter 20x20x5- Merv 13
(FC200E1011)

The Honeywell FC200E1011 Media Filter 20x20x5- Merv 13 is a replacement air filter for the Honeywell 20X20 F100 and F200 media air cleaners. This Honeywell air filter boasts a MERV 13 rating and removes over 97% of 3 to 10 micron particles from indo


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Honeywell FC200E1011 Media Filter 20x20x5- Merv 13
Our Price: $46.99
Retail: $55.99
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FiltersFast FFC21235TRNM13 Replacement for Trane BAYFTAH23M, 21x23x5 Perfect Fit
(FFC21235TRNM13)

The FiltersFast Brand Trane 21x23x5 Perfect Fit 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 2 to 3 business days.
FiltersFast FFC21235TRNM13 Replacement for Trane BAYFTAH23M, 21x23x5 Perfect Fit
Our Price: $90.95
Retail: $139.99
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Trion 255649-101 Air Bear Media AC Filter 16x25x3 6-Pack
(255649-101 6pack)

The Trion Air Bear 255649-101 AC Filter Media is a genuine Trion Air Bear pleated media filter. The 255649-101 can be used in Trion models Air Bear TM and Air Bear Cub. Replaces 229990-101 and 229990-001 as an upgrade.

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In stock! Ships in 1 business day.
Trion 255649-101 Air Bear Media AC Filter 16x25x3 6-Pack
Our Price: $100.95
Retail: $131.99
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GE WP85X10004 Zoneline Air Conditioner Filter
(WP85X10004)

This GE Zoneline Air Conditioner Filter (GE WP85X10004) is a slide in replacement AC filter that removes many contaminants in your air including dust, pollen, hair, pet dander, mold spores, and more. It is used in numerous General Electric Zoneline


Out of stock
GE WP85X10004 Zoneline Air Conditioner Filter
Our Price: $20.99
Retail: $24.99
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FiltersFast FFC20205HONM8 Replacement for Honeywell FC100A1011 - 20x20x5 2-Pack
(FFC20205HONM8)

FiltersFast Brand Honeywell 20x20x5 FC100A1011 2-Pack Air Filter is an economical compatible version of the OEM Honeywell FC100A1011 20"x20" Media AC Filter. To save money, this air filter replacement comes in a 2pk value set.


In Stock! Ships in 2 to 3 business days.
FiltersFast FFC20205HONM8 Replacement for Honeywell FC100A1011 - 20x20x5 2-Pack
Our Price: $44.90
Retail: $52.99
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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


Special Order. Ships in 9 days.
Trane Perfect Fit BAYFTAH23W1A Prefilter 23.5x21x1
Our Price: $22.33
Retail: $29.99
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Trion Air Bear 447380-010 Right Angle Media Air Cleaner
(447380-010)

The Trion Air Bear Right Angle Media Air Cleaner, part number 447380-002, provides a clean and controlled indoor air environment in your home. Ideal for installations that normally require a 90 degree duct adaptor.

Free shipping within the continental United States!

In Stock! Ships in 16 to 17 business days.
Trion Air Bear 447380-010 Right Angle Media Air Cleaner
Our Price: $123.83
Retail: $199.99
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FiltersFast FFC24265TRNM8 Replacement for Trane Perfect Fit BAYFTFR24M 2-Pack
(FFC24265TRNM8)

FiltersFast Brand Trane 24.5x27x5 Perfect Fit BAYFTFR24M air filter replacements are specifically designed to replace OEM Trane Perfect Fit BAYFTFR24M air filters.


In Stock! Ships in 4 to 5 business days.
FiltersFast FFC24265TRNM8 Replacement for Trane Perfect Fit BAYFTFR24M 2-Pack
Our Price: $50.95
Retail: $69.99
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Honeywell TRN2621T1 Replacement for Trane BAYFTAH26M, 26x21x5 Perfect Fit - 3-Pack
(TRN2621T1)

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

Free shipping within the continental United States!

In stock! Ships in 1 business day.
Honeywell TRN2621T1 Replacement for Trane BAYFTAH26M, 26x21x5 Perfect Fit - 3-Pack
Our Price: $141.50
Retail: $166.99
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Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1
(BAYFTAH26W1A)

The Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1 features a MERV 5 rating for the reduction of airborne particulates. This Trane Perfect Fit filter fits 26" enclosures and measures approximately 26" x 21" x 1". This Trane pre-filter is washable


In stock! Ships in 1 business day.
Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1
Our Price: $21.99
Retail: $29.99
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Honeywell FC40R1110 Return Grille Air Filter 14X20x3
(FC40R1110)

The Honeywell FC40R1110 is a return air grille filter that fits the following: Any return air grille that uses a 14 inch x 20 inch x 4 inch filter The Honeywell FC40R1110 Furnace Air Filter - 14X20 has a Minimum Efficiency Reporting Value (MER


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Honeywell FC40R1110 Return Grille Air Filter 14X20x3
Our Price: $62.95
Retail: $139.99
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Honeywell FC40R1144 Return Air Filter - 20x24
(FC40R1144)

The Honeywell FC40R1144 Return Air Filter - 20x24 is a replacement air filter that mounts in most return filter grilles. The Honeywell return air grille filter features four inches of depth, which provides a higher efficiency than standard one inch


In stock! Ships in 1 business day.
Honeywell FC40R1144 Return Air Filter - 20x24
Our Price: $50.25
Retail: $69.99
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GE WP85X10002 Air Conditioner Filter for Zoneline A/C (Right)
(WP85X10002)

This GE Air Conditioner Filter (WP85X10002) is a replacement filter for GE Zoneline air conditioning (A/C) units. This air conditioner filter only fits in the right side panel slot of the Zoneline A/C unit - the filter for the left side panel slot


Special Order. Ships in 27 days.
GE WP85X10002 Air Conditioner Filter for Zoneline A/C (Right)
Our Price: $25.25
Retail: $29.99
You Save 16%!

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FiltersFast FFC16253TAB Replacement for Trion 255649-101 3-Pack
(FFC16253TAB)

Replace your Trion Air Bear 255649-101 16x25x3 air filter with this FiltersFast compatible AC filter, which features a MERV 11 rating, an upgrade from the MERV 8 Trion Air Bear.


In Stock! Ships in 2 to 3 business days.
FiltersFast FFC16253TAB Replacement for Trion 255649-101 3-Pack
Our Price: $66.00
Retail: $77.99
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FiltersFast FFC16265WR Replacement for White Rodgers F825-0548 16x26x5 2-Pack
(FFC16265WR)

The FiltersFast Compatible 16x26x5 MERV 11 Air Filter can be used as an upgrade for White Rodgers part number F825-0548. Upgrade your White Rodgers Media Filter today and get a better filter for the same price as the original manufacturer's brand!


In Stock! Ships in 1 to 2 business days.
FiltersFast FFC16265WR Replacement for White Rodgers F825-0548 16x26x5 2-Pack
Our Price: $45.95
Retail: $55.99
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FiltersFast FFC21275TRNM13 Replacement for Trane BAYFTFR21M, 21x27x5 Perfect Fit - MERV13, 2-Pack
(FFC21275TRNM13)

FiltersFast Brand Trane 21x27x5 Perfect Fit BAYFTFR21M M13 x2 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 3 to 4 business days.
FiltersFast FFC21275TRNM13 Replacement for Trane BAYFTFR21M, 21x27x5 Perfect Fit - MERV13, 2-Pack
Our Price: $111.00
Retail: $139.99
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FiltersFast FFC24265TRNM13 Replacement for Trane BAYFTFR24M, 24x26x5 Perfect Fit - 2-Pack
(FFC24265TRNM13)

FiltersFast Brand Trane 24x26x5 Perfect Fit BAYFTFR24M

Free shipping within the continental United States!

In Stock! Ships in 2 to 3 business days.
FiltersFast FFC24265TRNM13 Replacement for Trane BAYFTFR24M, 24x26x5 Perfect Fit - 2-Pack
Our Price: $80.95
Retail: $139.99
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FiltersFast MERV 8 Pleated 1" Panel Filter 6-Pack
(FFM8PLEAT1)

The FiltersFast MERV 8 Pleated 1" Panel Filter 6-Pack is a set of replacement air filters for ideal use as service pleats or prefilters in commercial HVAC systems or industrial air cleaners. These pleated media filters arrive in a 6 pack and are ef


In Stock! Ships in 3 to 4 business days.
FiltersFast MERV 8 Pleated 1" Panel Filter 6-Pack
Our Price: $39.95
Retail: $49.99
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FiltersFast 5" FFC175275TRN OKGM Air Filter - 2-Pack
(FFC175275TRN OKGM)

The FiltersFast 5" Trane Compatible FFC175275TRN OKGM is a compatible replacement air filter that replaces the Trane BAYFTFR17M and Trane FLR06069 air filters, both of which can be used in several models of Trane Air Cleaners. This 5" filter boasts


In Stock! Ships in 1 to 2 business days.
FiltersFast 5" FFC175275TRN OKGM Air Filter - 2-Pack
Our Price: $70.99
Retail: $104.99
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Honeywell TRN1727T1 Replacement for Trane BAYFTFR17M, 17.5x27x5 Perfect Fit - 3-Pack
(TRN1727T1)

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 12 to 13 business days.
Honeywell TRN1727T1 Replacement for Trane BAYFTFR17M, 17.5x27x5 Perfect Fit - 3-Pack
Our Price: $144.00
Retail: $169.99
You Save 15%!

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Filters Fast - Furnace Filters

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