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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 75X73 Metal Mesh Filter Catalyst Insert Assembly
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within the continental U.S.


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Ships in 2 to 3 business days.

Retail: $189.99

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BestAir A35WPR Replacement For Trane BAYPAD02A1310A

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Retail: $15.99

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Lennox X0581 MERV 10 Pleated Furnace Filter Media

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Retail: $49.99

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Lennox X8312 HCXF16-16 MERV 16 Expandable Filter 16x25x5
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Retail: $124.99

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Lennox X5424 PMAC-20C MERV 16 25x20x6 Furnace Filter Media
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FiltersFast FFC20265WR Replacement for White Rodgers F825-0549 20x26x5 2Pack

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Retail: $79.99

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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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Lennox Genuine 92X10 HEPA Filter Replacement for HEPA-40, HEPA-60
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Retail: $284.99

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FiltersFast A10PR Replacement for Honeywell HC22
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Retail: $19.99

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GeneralAire 4401 13415 MERV 11 Filter Media for AC-4
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GeneralAire 4365 Replacement for GeneralAire 4350 MERV 10 Filter
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GeneralAire 4368 Replacement for GeneralAire 4356 Filter Media
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Honeywell FC100A1029 Replacement for Honeywell 203719 - 16x25x5
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FiltersFast FFC16205HONM13 Replacement for Honeywell FC100A1003

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Aprilaire 4270 Pleat Spacers for 2400/5000 - 6 Pack
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Lennox Y6616 PCO3-14-16 PureAir Annual Maintenance Kit 612988-03
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Honeywell 209989 Air Cleaner Pre-Filter - 16x20 - 2 Pack
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Retail: $99.99

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FiltersFast Replacement for Trane BAYFTFR14M2 Air Filter - 2-Pack

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Hamilton EP-036 Humidifier Evaporator Pad
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Retail: $24.99

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BestAir D11-C Replacement for Honeywell HC-811 Humidifier Filter
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FiltersFast A10PR Replacement for Lennox WB2-12
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BestAir A35WPR Replacement For Honeywell HC26P

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Lennox X2678 HEPA 20 Charcoal Carbon Filter

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Lennox X4137 HEPA-20 92017-11 Carbon PreFilter Replacement

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Aprilaire 4510 Replacement Air Filter - 1700, 1710A
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