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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?

Yes, both AC filters and furnace filters are the same thing. We categorize filters based on their intended use to make filter shopping easier for the customer. During the summer months you are more likely to search for AC filters. While during colder winter months you are looking to buy furnace filters. A good tip for remembering when to change your filters is to replace them at the start of each new season.

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?

Yes, Filtersfast, Filtrete, Carrier, among many other air filter brands use an electrostatically charged filter media. Fiberglass air filters are far less common today and were never designed to improve air quality, rather they protect HVAC systems from large dirt and debris.

Lennox furnace filters and air filters are needed to keep a good efficiency of your cooling and heating system.
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Lennox Air and Furnace Filters product list


FiltersFast FF20255X6673M11 Replacement for Lennox X6673 MERV11, 20x25x5 - 2-Pack
Our Price: $48.95
Retail: $59.99
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In Stock! Ships in 10 to 11 business days.
FiltersFast FF16255X6670M11 Replacement for Lennox X6670 MERV11, 16x25x5 - 2-Pack
Our Price: $45.95
Retail: $52.99
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In Stock! Ships in 9 to 10 business days.
Lennox Y6604 Healthy Climate PureAir PCO3-20-16 MERV 16 20x26x5
Our Price: $100.95
Retail: $124.99
You Save 19%!
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Free shipping within the continental United States!
In Stock! Ships in 5 to 6 business days.
FiltersFast FF16255X6670M13 Replacement for Lennox X6670 MERV13, 16x25x5 - 2-Pack
Our Price: $50.95
Retail: $58.99
You Save 14%!
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In Stock! Ships in 8 to 9 business days.
FiltersFast FF20255X6673M8 Replacement for Lennox X6673 MERV8, 20x25x5 - 2-Pack
Our Price: $41.95
Retail: $48.99
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In Stock! Ships in 6 to 7 business days.
FiltersFast FF20255X6673M13 Replacement for Lennox X6673 MERV13, 20x25x5 - 2-Pack
Our Price: $59.95
Retail: $69.99
You Save 14%!
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In Stock! Ships in 6 to 7 business days.
Lennox LB-71455 Media Filter, 24in x 20ft Roll - 30023
Our Price: $55.95
Retail: $65.99
You Save 15%!
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In Stock! Ships in 14 to 15 business days.
Lennox X8927 Healthy Climate PureAir 4 Lamp Clips for PCO-20-28
Our Price: $21.95
Retail: $29.99
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Lennox X8791 Healthy Climate PureAir Insert - PCO20-28
As Low As: $115.99
Retail: $152.99
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In Stock! Ships in 2 to 3 business days.
FiltersFast FF16255X6670M8 Replacement for Lennox X6670 MERV8, 16x25x5 - 2-Pack
Our Price: $36.95
Retail: $42.99
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In Stock! Ships in 3 to 4 business days.
Lennox Genuine 92X10 HEPA Filter Replacement for HEPA-40, HEPA-60
Our Price: $218.95
Retail: $284.99
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Free shipping within the continental United States!
In Stock! Ships in 6 to 7 business days.
Lennox X8792 Metal Mesh Insert for Healthy Climate PCO16-28
Our Price: $100.95
Retail: $159.99
You Save 37%!
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In Stock! Ships in 4 to 5 business days.
Lennox LB-71457 Media Filter 28-in x 20-ft - 30340
Our Price: $50.95
Retail: $69.99
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Lennox 75X66 Genuine Metal Mesh Insert Fits PureAir Model PCO-2OC
Our Price: $100.95
Retail: $199.99
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In Stock! Ships in 3 to 4 business days.
Lennox 72H02 Whole House System Air Filter
Our Price: $18.99
Retail: $21.99
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In Stock! Ships in 5 to 6 business days.
Lennox 75X73 Metal Mesh Filter Catalyst Insert Assembly
Our Price: $100.95
Retail: $189.99
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Lennox X8793 Healthy Climate PureAir Insert - PCO14-23
Our Price: $100.95
Retail: $199.99
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Free shipping within the continental United States!
In Stock! Ships in 2 to 3 business days.
Lennox 92X09 Healthy Climate 93014-21 HEPA 40-60 Carbon Filter
Our Price: $48.95
Retail: $56.99
You Save 14%!
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Lennox 91X23 MERV 8 14x20x1 Genuine Pleated Air Filters 4-Pack
Our Price: $34.95
Retail: $39.99
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In Stock! Ships in 2 to 3 business days.
Lennox 92X17 HEPA Filter Cartridge Replacement
Our Price: $150.95
Retail: $198.99
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Lennox 6-3636L 38" AC Condensate Drain Pan
Our Price: $50.99
Retail: $69.99
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In Stock! Ships in 5 to 6 business days.
Lennox 91X25 MERV 8 Pleated Air Filters
Our Price: $39.96
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Lennox 92X08 HEPA 40/60 Foam PreFilter Genuine Lennox Part
Our Price: $45.95
Retail: $69.99
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In Stock! Ships in 3 to 4 business days.
Lennox 72H09 EAC-2000 Carbon Filter Replacement
Our Price: $81.82
Retail: $111.99
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In Stock! Ships in 2 to 3 business days.
Lennox 69H85 Whole House Air Purifier Filter
Our Price: $77.10
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In Stock! Ships in 16 to 17 business days.
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