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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 FFC215215TRNM8 Replacement for Trane 21x21.5x5 BAYFTAH21M FLR06072 2-Pack

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FiltersFast FFC21235TRN Replacement for Trane Perfect Fit BAYFTAH23M 21x23.5x5 2pk
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within the continental U.S.


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Retail: $98.99

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Carrier GAPCCCAR2420 Air Purifier Filter
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FiltersFast FFC16255HONM8 Replacement for Honeywell FC100A1029 - 16x25x5, 2-Pack

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Retail: $59.99

Our Price: $39.95

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FiltersFast H64-C Replacement for Holmes HWF64 Humidifier Filter
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Retail: $14.99

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Honeywell FC40R1003 Return Grille Filter
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FiltersFast FFC175275TRN Replacement for Trane Perfect Fit BAYFTFR17M 17.5x27x5 2pk

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3M Filtrete 1500 MPR Allergen, Bacteria & Virus Air Filter (Purple) 6-Pack
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within the continental U.S.

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Retail: $152.99

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FiltersFast Replacement for Trane 21x27x5 Perfect Fit BAYFTFR21M - 2-Pack

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Retail: $77.99

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Carrier Bryant 49BF Humidifier Filter Replacement
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Retail: $41.95

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Honeywell HRF-AP1 Replacement For Honeywell 38002
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Retail: $19.99

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FiltersFast FFC16255HONM13 Replacement for Honeywell FC100A1029 16x25x4 MERV 13

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FiltersFast FFC20255HONM13 Replacement for Honeywell FC100A1037 - MERV 13, 2-PACK
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FiltersFast FFC162766SG Replacement for Aprilaire SpaceGard 2400 16x27x6 2-Pack

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3M Filtrete 2200 MPR Premium Allergen & Home Pollutants Air Filter (Deep Blue)

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Lennox X8788 MERV 16 PureAir Filter Replacement
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Lennox X0585 MERV 11 Pleated Media Filter - HCC14 Genuine Part

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Lennox Y6608 PCO3-20-16 Healthy Climate PureAir Annual Kit
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Retail: $178.99

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Trion Air Bear 259112-105 Cub Filter 16x25x5 MERV 11 - 3-Pack
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Trane Perfect Fit BAYFTAH26M2 FLR06074 MERV 8 26x21x5
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BestAir H85 Replacement for Holmes HWF62 Humidifier Filter - HM1280, HM1700

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Aprilaire 35 Replacement For Lennox X2661 Humidifier Water Panel Filter
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Lennox HC X6664 MERV 10 Air Filter Replacement

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Carrier GAPCCCAR1620 Infinity Merv 15 Air Purifier Filter
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FiltersFast EF1 R Replacement For Kenmore 14410 Emerson MoistAir EF1
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Retail: $19.99

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