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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:


TopTech TT-FM-1625 Techpure 16x25x4 MERV 11 Filter

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Ships in 1 to 2 business days.

Retail: $45.99

Our Price: $39.95

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FiltersFast A10WPR Replacement for Aprilaire 550 Humidifier Water Panel
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Retail: $19.99

As Low As: $13.99

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FiltersFast FFC162766SGM8 Replacement for Aprilaire SpaceGard 2400 MERV8 - 2-Pack

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Retail: $59.99

Our Price: $45.95

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Trion Air Bear 259112-103 Supreme Filter 20x20x5 MERV11 4-PacK
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within the continental U.S.

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Retail: $119.99

Our Price: $99.95

Save 17%!

Aprilaire 35 Replacement For Lennox X2661 Humidifier Water Panel Filter
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Retail: $24.99

Our Price: $16.95

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FiltersFast FF 30925 Replacement for Hunter 30925
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Retail: $24.99

Our Price: $19.99

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FiltersFast MERV 8 Pleated Filters 6-Pack

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Retail: $79.99

Our Price: $69.95

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Honeywell HC-888 Replacement Humidifier Filter
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Retail: $19.99

As Low As: $15.99

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BestAir A35PR Replacement for Lennox WB2-17 and WB2-18 Filter
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Retail: $14.99

As Low As: $9.95

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BestAir R14ALLM Universal Cut to Fit Carbon Pre Filter-2-Pack
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Retail: $24.99

Our Price: $19.95

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FiltersFast EF1 R Replacement For Kenmore 14410 Emerson MoistAir EF1
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Retail: $19.99

As Low As: $12.99

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Hunter 30901 Carbon Purifier Pre-Filter
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Retail: $29.99

As Low As: $22.99

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FiltersFast HAPF30 Replacement for Holmes HAPF30AT-U4
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Retail: $29.99

Our Price: $15.95

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Lennox X0445 MERV 10 PMAC-20C Pleated Furnace Filter Media

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Ships in 2 to 3 business days.

Retail: $59.99

As Low As: $44.95

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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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Honeywell 50000293-002 Post Filter for F300 2-Pack

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Retail: $69.99

Our Price: $59.95

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FiltersFast 4-inch MERV 8 Pleated Air Filters 3-Pack

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Retail: $59.99

Our Price: $59.95

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FiltersFast DSG401M11FF Replacement For Space-Gard SG4PR-B, Aprilaire 401 Filter - 2-Pack

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Retail: $61.99

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FiltersFast 611D R Replacement for Bionaire 611D Air Cleaner Filter
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Retail: $14.99

As Low As: $11.99

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Lennox X8309 MERV 10 Expandable Filter Replacement

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Retail: $49.99

Our Price: $46.95

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Carrier EXPXXFIL0024 EZ-FLEX Air Purifier Filter
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Retail: $99.99

Our Price: $59.95

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FiltersFast Replacement for GeneralAire 6FM2025 - MERV11, 20x25x5 - 2-Pack

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Retail: $59.99

Our Price: $49.95

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GeneralAire 4556 6FM2020 MERV11 Air Filter 20x20x5
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Retail: $49.99

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FiltersFast FF16255X6670M11 Replacement for Bryant-Carrier FILXXCAR0016 MERV11 - 2-Pack

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Retail: $69.99

Our Price: $45.95

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Lennox Y6606 PCO3-14-16 Air Filtration Filter PureAir 100908-12
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within the continental U.S.


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Ships in 1 to 2 business days.

Retail: $126.99

Our Price: $109.95

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