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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?
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:


FilterFast FFC215215TRNM13 Replacement for Trane BAYFTAH21M, 21.5x21x5 Perfect Fit - MERV13, 2-Pack
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within the continental U.S.


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Ships in 1 to 2 business days.

Retail: $139.99

Our Price: $79.95

Save 43%!

Lennox 75X66 Genuine Metal Mesh Insert Fits PureAir Model PCO-2OC
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within the continental U.S.


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Ships in 2 to 3 business days.

Retail: $199.99

As Low As: $89.95

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FiltersFast 711D R Replacement For Bionaire 711D Air Cleaner Filter

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Ships in 3 to 4 business days.

Retail: $19.99

Our Price: $15.95

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Aprilaire 4897 Conversion Frame for Model 5000
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Retail: $19.99

Our Price: $15.95

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FiltersFast A12PR Replacement for Aprilaire 12 Humidifier Filter
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Retail: $16.99

As Low As: $11.95

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FiltersFast A10PR R Replacement for Carrier HUMBBSBP2312-A
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Retail: $19.99

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Trion Air Bear 259112-105 Cub Filter 16x25x5 MERV 11
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Retail: $39.99

Our Price: $36.95

Save 8%!

BestAir D11-C Replacement for Honeywell HC-811 Humidifier Filter
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Retail: $12.99

Our Price: $9.99

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FiltersFast FFC24265TRNM8 Replacement for Trane Perfect Fit BAYFTFR24M 2-Pack

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Retail: $69.99

Our Price: $51.95

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FiltersFast FFC16253TABM13 Replacement for Trion 16x25x3 Air Bear MERV13 3-Pack
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within the continental U.S.


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Retail: $99.99

Our Price: $79.95

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FiltersFast HAPF30 Replacement for Holmes HAPF30D
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Retail: $29.99

Our Price: $15.95

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Honeywell FC40R1060 16x25 Return Air Grille Filter

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Retail: $59.99

Our Price: $49.99

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Honeywell TRN2321T1 Replacement for Trane BAYFTAH23M, 23.5x21x5 Perfect Fit - 3-Pack
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within the continental U.S.

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Retail: $179.99

Our Price: $159.95

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Honeywell FC40R1110 Return Grille Air Filter 14X20x3

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Retail: $69.99

Our Price: $49.95

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Totaline P102-1620 16x20 MERV 11 Filter

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Retail: $45.99

Our Price: $39.99

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Honeywell FC100A1029 Replacement for Honeywell 203719 - 16x25x5
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Retail: $46.99

Our Price: $39.99

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BestAir 24000 Replacement for Honeywell 24000
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Retail: $79.99

Our Price: $61.95

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FiltersFast FFC16253TAB Replacement for Trion 259112-101 3-Pack

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Retail: $79.99

Our Price: $68.95

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Trion Air Bear Media AC Filter 20x20x5 4-Pack
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within the continental U.S.

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Retail: $109.99

Our Price: $99.95

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GeneralAire 4401 13415 MERV 11 Filter Media for AC-4
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Retail: $44.99

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GeneralAire 3FM1625 MERV 8 Filter Media Cartridge
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Retail: $29.99

Our Price: $27.99

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FiltersFast FFC16265WRM8 Replacement for White Rodgers 16x26x5 F825-0548 - 2-Pack

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Retail: $59.99

Our Price: $49.95

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FiltersFast A10PR Replacement for Lennox WB2-12
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Retail: $19.99

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FiltersFast A10PR Replacement for Honeywell HC22
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Retail: $19.99

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Trion Air Bear 259112-101 Cub Filter 16x25x3 MERV 11
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Retail: $32.99

Our Price: $28.99

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