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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.

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.


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Furnace Filters product list


GE 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 10 days.
GE Air Conditioner Filter for Zoneline A/C (Right)
Our Price: $15.08
Retail: $29.99
You Save 50%!

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Honeywell FC40R1037 12x24 Return Air Grille Filter
(FC40R1037)

The Honeywell FC40R1037 Return Aire Grille Filter is a high efficiency, replacement for return grille applications. Designed to capture airborne particles that circulate through the filter. Nominal Dimension 12x24x4. Genuine Honeywell Part.


Out of stock
Honeywell FC40R1037 12x24 Return Air Grille Filter
Our Price: $39.50
Retail: $45.00
You Save 12%!

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Honeywell FC40R1102 Return Grille Filter-14x14x3
(FC40R1102)

The Honeywell FC40R1102 is a high-efficiency, replacement air filter for return grille applications. Designed to capture airborne particles that circulate through the AC filter. Nominal Dimension 14x14x4. Genuine Honeywell Part.


Out of stock
Honeywell FC40R1102 Return Grille Filter-14x14x3
As Low As: $26.17
Retail: $34.99
You Save 25%!

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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 22 days.
Trane Perfect Fit BAYFTFR21P4A Filter - 21x27x1
Our Price: $19.90
Retail: $19.99
You Save 0%!

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Filters Fast 4-inch MERV 8 Air Filters 6-Pack
(FFM8PLEAT 4)

The Filters Fast 4-inch MERV 8 4"Air Filters 6-pack is compatible with: Aprilaire Space-Gard Trion Air Bear Honeywell and other top name brand air conditioning filters. Usable in residential, commercial, and industrial applications, the


In Stock! Ships in 1 to 2 business days.
Filters Fast 4-inch MERV 8 Air Filters 6-Pack
Our Price: $62.99
Retail: $69.99
You Save 10%!

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White Rodgers 16x26x5 Furnace Filter F825-0548 2pk
(FFC16265WRM8)

If you are looking for an economical compatible alternative for the OEM White Rodgers 16x26x5 Air Furnace Filter try this White Rodgers 16x26x5 Furnace Filter Replacement F825-0548.


In Stock! Ships in 1 to 2 business days.
White Rodgers 16x26x5 Furnace Filter F825-0548 2pk
Our Price: $57.00
Retail: $59.99
You Save 5%!

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Honeywell HFC40R1011 Return Grille Filter 20"x25"
(HFC40R1011)

The Honeywell HFC40R1011 20"x25" Return Air Grille Filter is a high efficiency replacement air filter for return grille air filtration applications. Honeywell replacement filters efficiently capture harmful airborne particles such as dust, pet dande


In Stock! Ships in 1 to 2 business days.
Honeywell HFC40R1011 Return Grille Filter 20"x25"
Our Price: $49.99
Retail: $60.00
You Save 17%!

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Honeywell FC40R1094 12x12x3 Return Grille Filter
(FC40R1094)

The Honeywell FC40R1094 is a high-efficiency, replacement air filter for return grille applications. Designed to capture airborne particles that circulate through the filter. Nominal Dimension 12x12x4. Genuine Honeywell Part.


In stock! Ships in 1 business day.
Honeywell FC40R1094 12x12x3 Return Grille Filter
As Low As: $37.50
Retail: $50.00
You Save 25%!

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F825-0548 White Rodgers Compatible 16x26x5, 2pk
(FFC16265WR)

The Filters Fast 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.
F825-0548 White Rodgers Compatible 16x26x5, 2pk
Our Price: $54.25
Retail: $55.25
You Save 2%!

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Trane Perfect Fit Filter 23.5x21x5 BAYFTAH23M 3-Pk
(HTRN2321T1)

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 23.5x21x5 BAYFTAH23M 3-Pk
Our Price: $147.00
Retail: $160.00
You Save 8%!

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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.

Free shipping within the continental United States!

In Stock! Ships in 1 to 2 business days.
Trane 21x26x5 Perfect Fit Filter BAYFTAH26M M13 x2
Our Price: $110.00
Retail: $140.00
You Save 21%!

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Honeywell FC100A1045 21.5" x 27.5" Media Filter
(FC100A1045)

The Honeywell FC100A1045 21.5" x 27.5" Media Filter is a high efficiency Media Air Filter that can be used in Honeywell Model F27F1057. Genuine Honeywell Part.


Out of stock
Honeywell FC100A1045 21.5" x 27.5" Media Filter
As Low As: $53.99
Retail: $59.99
You Save 10%!

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Trion 16x25x3 Air Bear Cub Filter - MERV 13 3-Pack
(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 3-Pack
Our Price: $83.00
Retail: $100.00
You Save 17%!

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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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Filters Fast MERV 8 Pleated 1" Panel Filter 6-Pack
(FFM8PLEAT1)

The Filters Fast 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 1 to 2 business days.
Filters Fast MERV 8 Pleated 1" Panel Filter 6-Pack
Our Price: $36.99
Retail: $49.99
You Save 26%!

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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


Out of stock
Trane Perfect Fit BAYFTAH26W1A Pre-filter 21x26x1
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GE 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.


Special Order. Ships in 13 days.
GE Air Conditioner Filter for Zoneline A/C (Left)
Our Price: $17.55
Retail: $22.99
You Save 24%!

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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


Special Order. Ships in 23 days.
Trane BAYFTAH21P4A Pleated 1 inch Filter 21.5x21x1
Our Price: $11.83
Retail: $14.99
You Save 21%!

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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


In Stock! Ships in 5 to 6 business days.
Honeywell FC200E1011 Media Filter 20x20x5- Merv 13
Our Price: $44.99

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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


Out of stock
Trane Perfect Fit BAYFTFR24M2A Filter - 24.5x27x5
Our Price: $49.73
Retail: $59.99
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


Out of stock
Trane Perfect Fit BAYFTAH23W1A Prefilter 23.5x21x1
Our Price: $20.33
Retail: $29.99
You Save 32%!

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Trion Air Bear Supreme 2000 Media Air Cleaner
(455602-025)

The Trion Air Bear Supreme 2000 Media Air Cleaner, part number 455602-019, provides a clean and controlled indoor air environment in your home by removing dirt, dust, pollen and other microscopic particles from your air.


Special Order. Ships in 17 days.
Trion Air Bear Supreme 2000 Media Air Cleaner
Our Price: $71.21
Retail: $120.74
You Save 41%!

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Honeywell FC40R1052 16x20 Return Air Grille Filter
(FC40R1052)

The Honeywell FC40R1052 is a high-efficiency, replacement AC filter for return grille applications. Designed to capture airborne particles that circulate through the filter. Nominal Dimension 16x20x4. Genuine Honeywell Part.


Out of stock
Honeywell FC40R1052 16x20 Return Air Grille Filter
As Low As: $48.99
Retail: $53.00
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

Free shipping within the continental United States!

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 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

Free shipping within the continental United States!

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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Filters Fast - Furnace Filters

" Just to express my complete satisfaction with your ordering process and, of course, great pricing. When I need a replacement of refrigerator or HVAC filters, I'll be contacting you again. " - Frank, Corona, CA
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