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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:


FiltersFast A10PR R Replacement for Trane BAYPAD01A1010A
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Retail: $19.99

As Low As: $8.95

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Lennox X8789 PureAir PCO16-28 MERV 16 Filter Genuine Lennox Part
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within the continental U.S.


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Ships in 3 to 4 business days.

Retail: $226.99

Our Price: $144.95

Save 36%!

Lennox X8790 PCO14-23 MERV 16 Air Filter Replacement
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within the continental U.S.


In Stock!
Ships in 2 to 3 business days.

Retail: $228.99

Our Price: $149.95

Save 35%!

Lennox X2660 Humidifier Water Panel Filter

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Ships in 2 to 3 business days.

Retail: $44.99

Our Price: $19.95

Save 56%!

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

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Ships in 1 to 2 business days.

Retail: $69.99

Our Price: $45.95

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FiltersFast 1" Air Filters MERV 8 Replacement for Rheem FPR 4 6-Pack

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Ships in 1 to 2 business days.

Retail: $66.99

Our Price: $56.95

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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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Honeywell FC40R1011 Return Grille Filter 20"x25"

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Retail: $59.99

Our Price: $49.99

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FiltersFast FFC20205HONM13 Replacement for Honeywell FC100A1011, 20x20x5 2-Pack

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Ships in 1 to 2 business days.

Retail: $95.99

Our Price: $74.95

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Lennox X0587 MERV 10 Pleated Media Filter

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Retail: $59.99

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FiltersFast FFC26215TRNM13 Replacement for Trane BAYFTAH26M, 21x26x5 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: $119.99

Our Price: $89.95

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FiltersFast D13-C Replacement for Honeywell HAC-506 2-Pack
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Retail: $14.99

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Aprilaire 4270 Pleat Spacers for 2400/5000 - 6 Pack
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within the continental U.S.

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Retail: $89.99

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BioStrike CFF Ceiling Fan Air Filter - 93880
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FiltersFast FFC20265WRM8 Replacement for White Rodgers 20x26x5 F825-0549 2-Pack

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Retail: $59.99

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Hamilton EP-036 Humidifier Evaporator Pad
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Retail: $24.99

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Lennox X1152 MERV 11 Pleated Media Furnace Filter MF1-20

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Retail: $49.99

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GeneralAire 4610 HMK500 Filter Replacement Kit 2-Pack
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Retail: $89.99

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Lennox X8310 MERV 11 Expandable Filter Replacement

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Retail: $49.99

Our Price: $44.95

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FiltersFast FFC20255HONM8 Replacement for Honeywell 20x25x5 FC100A1037 2-Pack

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Retail: $59.99

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FiltersFast FFC20205HONM8 Replacement for Honeywell FC100A1011 - 20x20x5 2-Pack

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Retail: $52.99

Our Price: $39.95

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Aprilaire 12 Replacement Water Panel
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Retail: $24.99

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Honeywell FC40R1169 14x30 Return Grille Air Filter
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Retail: $59.99

Our Price: $44.95

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Honeywell 203371 Air Cleaner Pre-Filter 2-PACK
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Retail: $79.99

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Honeywell 50000293-001 Post Air Filter 2-Pack

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Ships in 2 to 3 business days.

Retail: $59.95

Our Price: $54.95

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