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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:


BestAir HM2PR Replacement for Honeywell 32000146-001
In Stock!
Ships in 1 business day

Retail: $19.99

As Low As: $12.99

Save 35%!

Lennox X8312 HCXF16-16 MERV 16 Expandable Filter 16x25x5
FREE SHIPPING!

within the continental U.S.


In Stock!
Ships in 2 to 3 business days.

Retail: $124.99

As Low As: $99.95

Save 20%!

GeneralAire 4366 Replacement for GeneralAire 4352 - GA100A29
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Ships in 1 business day

Retail: $59.99

Our Price: $38.99

Save 35%!

FiltersFast FFC16255HON 16x25x5 MERV 11 Air Filter - 2-Pack

In Stock!
Ships in 1 to 2 business days.

Retail: $94.99

Our Price: $49.95

Save 47%!

FiltersFast FF4M8-20254, 20x25x4 MERV8 Replacement for GeneralAire FP2025 3-Pack

In Stock!
Ships in 1 to 2 business days.

Retail: $59.99

Our Price: $59.95

Save 0%!

Crane HS-1934 Replacement Air Purifier Filter Set

Out of stock

Retail: $34.99

Our Price: $29.95

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GE WB02X10700 Compatible Oven Range Hood Filter
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Ships in 1 business day

Retail: $24.99

Our Price: $17.95

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Honeywell FC40R1037 12x24 Return Air Grille Filter

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Ships in 1 to 2 business days.

Retail: $44.99

Our Price: $39.99

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Trion 255649-101 Air Bear Media AC Filter 16x25x3 6-Pack
FREE SHIPPING!

within the continental U.S.

In Stock!
Ships in 1 business day

Retail: $131.99

Our Price: $106.95

Save 19%!

Honeywell 203369 Pre-Filter 12.5 x 20 x 11/32 2-Pack

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Ships in 5 to 6 business days.

Retail: $69.99

Our Price: $59.95

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Honeywell 209989 Air Cleaner Pre-Filter - 16x20 - 2 Pack
FREE SHIPPING!

within the continental U.S.


In Stock!
Ships in 1 to 2 business days.

Retail: $99.99

Our Price: $85.95

Save 14%!

FiltersFast FF 30915 Replacement for Hunter 30915
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Ships in 1 business day

Retail: $19.99

Our Price: $14.95

Save 25%!

BestAir A35PR Replacement for SPACE-GARD 35
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Ships in 1 business day

Retail: $14.99

As Low As: $9.95

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GeneralAire F1021, 4572 MERV 13 16x25x4 Media Filter
Special Order.
Ships in 7 to 8 days.

Retail: $79.99

Our Price: $69.95

Save 13%!

GeneralAire 4365 Replacement for GeneralAire 4350 MERV 10 Filter
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Retail: $41.99

Our Price: $35.99

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GeneralAire 4368 Replacement for GeneralAire 4356 Filter Media
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Retail: $49.99

Our Price: $34.99

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Aprilaire 261 Spacegard 2600 Filter Media Replacement
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Retail: $85.99

Our Price: $64.99

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Carrier 318518-762 Humidifier Filter Replacement
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Retail: $49.99

Our Price: $44.99

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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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Aprilaire 4510 Replacement Air Filter - 1700, 1710A
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Retail: $44.99

Our Price: $38.95

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Lennox 72H02 Whole House System Air Filter

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Ships in 10 to 11 business days.

Retail: $29.99

Our Price: $26.95

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Lennox X4137 HEPA-20 92017-11 Carbon PreFilter Replacement

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Ships in 5 to 6 business days.

Retail: $46.99

Our Price: $39.95

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FiltersFast A10PR R Replacement for Totaline P110-0007
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Retail: $19.99

As Low As: $8.95

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FiltersFast A10PR R Replacement for Bryant P1101045
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Retail: $19.99

As Low As: $8.95

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FiltersFast FFC16255TABM8 Replacement For Trion AB-51625-8

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Ships in 1 to 2 business days.

Retail: $69.99

Our Price: $39.95

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