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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?
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?
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Air Filters full product list:


Trion Air Bear Media Filter 3-Pack 16x25x5, MERV 8
In Stock!
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Retail: $79.99

Our Price: $69.95

Save 13%!

Honeywell FC40R1029 20x30x3 Return Grille Filter
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Retail: $59.99

As Low As: $46.95

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FiltersFast FFC215215TRNM8 Replacement for Trane 21x21.5x5 BAYFTAH21M FLR06072 2-Pack

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Ships in 1 to 2 business days.

Retail: $69.99

As Low As: $45.95

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FiltersFast FFC20256SGM8 Replacement for Aprilaire SpaceGard 2200 MERV8 2-Pack

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Ships in 1 to 2 business days.

Retail: $67.99

Our Price: $49.95

Save 27%!

Carrier EXPXXFIL0020 EZ-FLEX Air Purifier Filter
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Retail: $59.99

Our Price: $47.95

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Trane Perfect Fit BAYFTAH23M2  21"x23.5"x5"
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Retail: $69.99

As Low As: $46.95

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GeneralAire GA19 Humidifier Vapor Pad Replacement
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Retail: $18.99

As Low As: $12.99

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FiltersFast FFC162766SG Replacement for Aprilaire SpaceGard 2400 16x27x6 2-Pack

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Retail: $99.99

Our Price: $64.95

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Lennox X6670 MERV 11 Pleated Filter Media-16x25x5

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Retail: $59.99

As Low As: $37.95

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FiltersFast FFC21235TRN Replacement for Trane Perfect Fit BAYFTAH23M 21x23.5x5 2pk
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within the continental U.S.


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Retail: $98.99

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Lennox Y6605 16x26x5 MERV 16 PureAir 100908-11 for PCO3-16-16
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within the continental U.S.


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Ships in 2 to 3 business days.

Retail: $119.99

Our Price: $105.95

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FiltersFast FFC20205TABM8 Replacement For Trion MERV 8 Filter 20x20x5 2-Pack

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Retail: $59.99

Our Price: $39.95

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Lennox X6675 MERV 16 Furnace Filter Replacement for HCC20-28
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within the continental U.S.


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Ships in 2 to 3 business days.

Retail: $149.99

Our Price: $129.95

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Lennox X0585 MERV 11 Pleated Media Filter - HCC14 Genuine Part

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Retail: $49.99

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FAPF02 Air Filter, Replacement for FAP02-RS
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Retail: $30.99

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Honeywell 50000293-004 Post Filter 12.5x20 2-Pack
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Retail: $69.99

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Honeywell FC40R1003 Return Grille Filter
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Retail: $59.99

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BestAir A35PR Replacement for Trane BAYPAD02A1310A
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Retail: $14.99

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FiltersFast FFC175275TRN Replacement for Trane Perfect Fit BAYFTFR17M 17.5x27x5 2pk

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Retail: $99.99

Our Price: $71.95

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FiltersFast FFC215215TRN Replacement for Trane Perfect Fit BAYFTAH21M 21.5x21x5 (2-Pack)

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Retail: $98.99

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3M Filtrete 1500 MPR Allergen, Bacteria & Virus Air Filter (Purple) 6-Pack
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within the continental U.S.

Out of stock

Retail: $152.99

Our Price: $134.99

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Carrier Bryant 49BF Humidifier Filter Replacement
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Retail: $41.95

Our Price: $35.95

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TopTech TT-FM-2025 Techpure 20x25x4 MERV 11 Filter

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Retail: $44.99

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Trion 255649-103 Air Bear Media Filter 20x20x5
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Retail: $36.99

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FiltersFast FFC21235TRNM8 Replacement for Trane 21x23x5 Perfect Fit BAYFTAH23M 2-Pack

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Ships in 1 to 2 business days.

Retail: $79.99

Our Price: $53.95

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