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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:


Lennox X8313 Healthy Climate HCXF20-16 MERV 16 Expandable Filter
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within the continental U.S.

In Stock!
Ships in 3 to 4 business days.

Retail: $149.99

Our Price: $119.95

Save 20%!

Lennox 72H02 Whole House System Air Filter
In Stock!
Ships in 2 to 3 business days.

Retail: $34.99

Our Price: $21.99

Save 37%!

Lennox 94X98 HEPA 20 Filter System Carbon Canister
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within the continental U.S.

In Stock!
Ships in 3 to 4 business days.

Retail: $169.99

Our Price: $114.95

Save 32%!

Totaline P102-2025 20x25 MERV 11 Filter
In Stock!
Ships in 1 to 2 business days.

Retail: $50.99

Our Price: $45.99

Save 10%!

Lennox X6666 MERV 16 Pleated Air Filter Media for PCO-12C 17x26x4
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within the continental U.S.

In Stock!
Ships in 4 to 5 business days.

Retail: $149.99

Our Price: $119.95

Save 20%!

BioStrike CFF Ceiling Fan Air Filter - 93880
In Stock!
Ships in 1 business day

Retail: $14.99

Our Price: $12.49

Save 17%!

GeneralAire F1020, 4562 MERV 13 Filter Media Replacement
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within the continental U.S.

Special Order.
Ships in 5 to 6 days.

Retail: $149.99

Our Price: $129.95

Save 13%!

Lennox 92X17 HEPA Filter Cartridge Replacement
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within the continental U.S.

In Stock!
Ships in 5 to 6 business days.

Retail: $249.99

Our Price: $199.95

Save 20%!

Filtrete Deep 1500 Replacement 4" Air Filter
Special Order.
Ships in 5 to 6 days.

Retail: $188.99

Our Price: $159.90

Save 15%!

Lennox X8348 PCO-20C MERV 10 Filter Maintenance Kit
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within the continental U.S.

In Stock!
Ships in 2 to 3 business days.

Retail: $399.99

Our Price: $339.95

Save 15%!

GeneralAire 401-13156 MERV 11 Filter Media
In Stock!
Ships in 1 business day

Retail: $69.99

Our Price: $49.95

Save 29%!

Lennox Y2920 Whole House Air Filter Cabinet - Genuine Lennox Part
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within the continental U.S.

In Stock!
Ships in 4 to 5 business days.

Retail: $139.99

Our Price: $108.95

Save 22%!

Filters Fast® FFC16255TABM8 Replacement For Trion AB-51625-8
In Stock!
Ships in 1 to 2 business days.

Retail: $50.99

Our Price: $40.95

Save 20%!

3M Filtrete 300 MPR Basic Dust & Lint Air Filter
Special Order.
Ships in 5 to 6 days.

Our Price: $71.70

Lennox X6661 HCC20-28 Healthy Climate HC16 Cabinet
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within the continental U.S.

In Stock!
Ships in 3 to 4 business days.

Retail: $149.99

Our Price: $109.95

Save 27%!

Lennox X8347 MERV 16 Filter Maintenance Kit for PCO-12C
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within the continental U.S.

In Stock!
Ships in 2 to 3 business days.

Retail: $499.99

Our Price: $349.95

Save 30%!

Lennox 98N42 MERV 8 Pleated Furnace Filters 4-Pack
In Stock!
Ships in 2 to 3 business days.

Retail: $69.99

Our Price: $42.95

Save 39%!

Goodman G13MU1625 Replacement Air Filters 3-Pack
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within the continental U.S.

In Stock!
Ships in 5 to 6 business days.

Retail: $299.99

Our Price: $250.99

Save 16%!

Lennox X0582 MERV 11 Air Cleaner Media Filter
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within the continental U.S.

In Stock!
Ships in 5 to 6 business days.

Retail: $79.99

Our Price: $39.95

Save 50%!

FiltersFast R14ALLM Replacement For Kaz Premium 2-Pack
In Stock!
Ships in 1 business day

Retail: $24.99

Our Price: $19.95

Save 20%!

Lennox X8314 MERV 16 Expandable Filter Replacement for PMAC-20C
In Stock!
Ships in 2 to 3 business days.

Retail: $115.99

Our Price: $95.95

Save 17%!

GeneralAire 100328 Ventilator Filter Replacement
Special Order.
Ships in 5 to 6 days.

Retail: $78.06

Our Price: $52.04

Save 33%!

Filtrete Home Odor Air Filter- 14 x 20 x 1 - 4-Pack
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within the continental U.S.

Special Order.
Ships in 5 to 6 days.

Retail: $149.99

Our Price: $119.96

Save 20%!

Filtrete One Inch Odor Air Filter - 20 x 30 x 1
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within the continental U.S.

Special Order.
Ships in 5 to 6 days.

Our Price: $119.96

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