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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:


MERV 8 FiltersFast 4" AC and Furnace Air Filters 3-pack

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Retail: $69.99

Our Price: $59.95

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Merv 13 FiltersFast 1" Allergy AC and Furnace Filters 6-Pack

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Retail: $89.99

Our Price: $74.90

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MERV 8 FiltersFast 1" AC and Furnace Air Filters 6-Pack

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Retail: $66.99

Our Price: $56.95

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Official Aprilaire 213 Allergy Filter for Aprilaire 2210, 2200 & 4200 - MERV 13
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Retail: $79.99

As Low As: $46.95

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MERV 11 FiltersFast 1" AC and Furnace Air Filters - 6-Pack

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Retail: $79.99

Our Price: $69.95

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FiltersFast Custom Size Air Filters - Made to your size Fast
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Retail: $63.99

Our Price: $19.99

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Official Aprilaire 413 Allergy Filter Media Replacement 2410, 4400 - MERV 13
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Retail: $59.99

As Low As: $44.95

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MERV 13 FiltersFast 4" Allergy AC and Furnace Filter 3-Pack
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within the continental U.S.


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Retail: $99.99

Our Price: $84.95

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MERV 11 FiltersFast 4" AC and Furnace Air Filters 3-pack

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Retail: $79.99

Our Price: $69.95

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Official Aprilaire 210 Clean Air Replacement Air Filter Media
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Retail: $59.99

As Low As: $44.95

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Aprilaire 501 Replacement Filter For Model 5000
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Retail: $49.99

As Low As: $40.95

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MERV 8 FiltersFast 2" AC and Furnace Air Filters 6-Pack

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Retail: $79.99

Our Price: $69.95

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Aprilaire 201 Replacement Filter for 2200, 2250 Air Purifiers
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Retail: $46.99

As Low As: $30.95

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FiltersFast FFC20255TABM8 20x25x5 Filter 2-Pack

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Retail: $49.99

Our Price: $39.95

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MERV 13 FiltersFast 2" Allergy AC and Furnace Filters 6-Pack
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within the continental U.S.


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Retail: $149.99

Our Price: $99.95

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FiltersFast FFC20255TAB Replacement for Trion 259112-102 2-Pack

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Retail: $59.99

Our Price: $49.95

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Carrier GAPCCCAR1625 Air Filter for GAPAAXCC1625
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Retail: $101.99

Our Price: $87.95

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Carrier GAPCCCAR2025 Air Filter for GAPAAXCC2025
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Retail: $149.99

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Lennox X6673 MERV 11 HCF20-11 HCF20-16 Filter Replacement-20x25x5

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Retail: $79.99

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Carrier GAPCCCAR2020 Air Purifier Filter
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within the continental U.S.


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Retail: $99.99

Our Price: $89.95

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

Our Price: $39.99

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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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Carrier GAPCCCAR2420 Air Purifier Filter
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Retail: $119.99

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FiltersFast FFC175275TRNM8 Replacement for Trane 17.5x27x5 BAYFTFR17M 2-Pack

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Retail: $69.99

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Carrier GAPCCCAR1620 Infinity Merv 15 Air Purifier Filter
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Retail: $101.99

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