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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 X0445 MERV 10 PMAC-20C Pleated Furnace Filter Media
In Stock!
Ships in 4 to 5 business days.

Retail: $80.99

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Lennox Y6608 PCO3-20-16 Healthy Climate PureAir Annual Kit
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within the continental U.S.

In Stock!
Ships in 5 to 6 business days.

Retail: $239.99

Our Price: $184.95

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3M Filtrete Home Odor AC Filter - 20 x 25 x 1
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Retail: $29.99

Our Price: $24.95

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GeneralAire HF500 HEPA Filter for AC500
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within the continental U.S.

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Retail: $169.95

Our Price: $139.95

Save 18%!

Lennox X0444 MERV 10 Pleated Furnace Filter Media PMAC-12C
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Retail: $80.99

Our Price: $52.95

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Lennox 75X66 Genuine Metal Mesh Insert Fits PureAir Model PCO-2OC
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within the continental U.S.

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Filters Fast® DSG401M11FF Replacement For Space-Gard SG4PR-B, Aprilaire 401 Filter - 2-Pack
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Retail: $70.99

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Aprilaire 4270 Pleat Spacers for 2400/5000 - 6 Pack
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Retail: $89.99

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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: $229.99

Our Price: $156.95

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Filters Fast® Replacement for Bryant, Carrier FILXXFNC0021 Filter 2Pack
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Ships in 1 to 2 business days.

Retail: $70.99

Our Price: $60.95

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Lennox X8310 MERV 11 Expandable Filter Replacement
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Ships in 3 to 4 business days.

Retail: $74.99

Our Price: $49.95

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Trion Air Bear 259112-103 Supreme Filter 20x20x5 MERV11
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Retail: $49.95

Our Price: $39.95

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Bionaire 611D Replacement For Bionaire 611DCS Compatible Dual Air Filter
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Lennox X4138 HEPA 40-60 Carbon PreFilter
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GeneralAire 4401 13415 MERV 11 Filter Media for AC-4
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Retail: $44.99

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Lennox X8311 MERV 10 Expandable Filter Replacement for HCXF14
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Retail: $69.99

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FiltersFast A2001D R Replacement for Bionaire A2001D Filter

Out of stock

Retail: $29.99

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Trion 259112-101 Air Bear Cub Filter 16x25x3 MERV 11 - 6-Pack
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Retail: $109.99

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Aprilaire 1413 Air Filter Performance Upgrade Kit
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Aprilaire 4897 Conversion Frame for Model 5000
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Retail: $19.99

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Lennox 92X09 Healthy Climate 93014-21 HEPA 40-60 Carbon Filter
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Retail: $100.99

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GeneralAire 3FM1625 MERV 8 Filter Media Cartridge
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Retail: $39.99

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FiltersFast HAPF600 R Replacement for Bionaire HAPF600CS R
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Retail: $49.99

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Lennox X0581 MERV 10 Pleated Furnace Filter Media
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Retail: $69.99

Our Price: $46.95

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Lennox X0584 MERV 11 Pleated Media Filter BMAC-14CE
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Retail: $84.99

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