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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:


Honeywell FC100A1029 Media Furnace Filter- 16 x 25
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Retail: $46.99

Our Price: $39.99

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3M Filtrete 1000 MPR Allergen Defense Air Filter (Red)
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Retail: $29.99

Our Price: $23.95

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Trion Air Bear Filter 20 x 25 x 5 - 255649-102
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Retail: $34.99

Our Price: $29.99

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Trion 255649-105 Air Bear HVAC Filter - 16x25x5

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Retail: $54.99

Our Price: $29.95

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FiltersFast FFC26215TRNM8 Replacement for Trane 21x26x5 Perfect Fit BAYFTAH26M 2-Pack

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Retail: $69.99

Our Price: $49.95

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FiltersFast FFC16255TABM8 Replacement for Trion 16x25x5 Air Bear Filters MERV8 - 2-Pack

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Retail: $49.99

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3M Filtrete 1500 MPR Allergen, Bacteria & Virus Air Filter (Purple)
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Retail: $39.99

Our Price: $29.99

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Honeywell FC100A1011 20"x20" Media AC Filter Genuine Part
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Retail: $49.99

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Honeywell Enviracaire HC26E1004 Humidifier Filter
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Retail: $29.99

As Low As: $18.45

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FiltersFast FFC175275TRNM8 Replacement for Trane 17.5x27x5 BAYFTFR17M 2-Pack

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Retail: $69.99

Our Price: $49.95

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Honeywell HAC-504 Replacement Humidifier Filter
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Retail: $19.99

Our Price: $16.95

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3M Filtrete 1900 MPR Premium Allergen, Bacteria, & Virus Air Filter (Blue) 6-Pack
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within the continental U.S.

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Retail: $164.99

Our Price: $144.99

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Honeywell PopUp Collapsable Air Filter - MERV 11

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Retail: $49.99

Our Price: $43.95

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FiltersFast FFC20255HON Replacement for Honeywell FC100A1037 20x25x5, 2-pack

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Retail: $74.99

Our Price: $55.95

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FiltersFast FFC162766SGMM13 Replacement for Aprilaire 2400 MERV13

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Retail: $99.99

Our Price: $71.90

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AirCare 1051 Evaporative Humidifier Air Filter
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Retail: $24.99

As Low As: $15.95

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3M Filtrete 1000 MPR Allergen Defense Air Filter (Red) 6-Pack
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within the continental U.S.

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Retail: $159.99

Our Price: $128.99

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FiltersFast D88 R Replacement for Honeywell HC-888
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Retail: $12.99

Our Price: $9.99

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FiltersFast A10PR R Replacement for Aprilaire 10
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Retail: $19.99

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FiltersFast FFC16255HON Replacement for FC100A1029, FILCCCAR0016 16x25x5, 2-Pack

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Retail: $69.99

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FiltersFast FFFAPF03 Replacement for 3M Filtrete FAPF03
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Retail: $39.99

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GeneralAire 990-13 Evaporator Filter Pad - 7002
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Retail: $29.99

Our Price: $18.95

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FiltersFast FFC20256SGM13 Replacement for Aprilaire SpaceGard 2200 2250 Air Filter - MERV 13
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within the continental U.S.


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Retail: $97.99

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Trane BAYFTFREXM2 FLR06232 Expandable Replacement-2-Pack

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Retail: $79.99

Our Price: $69.95

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FiltersFast FFC20205HON Replacement for Honeywell FC100A1011 20x20x5, 2-Pack

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Retail: $69.99

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