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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.

GeneralAire replacement Furnace air filters reduce contaminants that may cause allergies. Furnace filters are necessary for all heating and cooling applications.


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GeneralAire Furnace Filters product list


FiltersFast GeneralAire Compatible 20x24x5, 2-pack
(FFC20245GA)

The Filters Fast Compatible 20x24x5 MERV 11 Air Filter can be used as a replacement for GeneralAire part number 12758. Fits Generalaire AC-1 and Byrant 902BXX020.


In Stock! Ships in 12 to 13 business days.
FiltersFast GeneralAire Compatible 20x24x5, 2-pack
Our Price: $48.25
Retail: $49.25
You Save 2%!

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GeneralAire AC-1 Filter 20x24x5 MERV 13 (2 PACK)
(FFC20245GAM13)

The GeneralAire AC-1 Air Filter 20x24x5 is a cost-effective compatible version of the genuine 20x24x5 General Filter AC-1 Air Filters.


In Stock! Ships in 12 to 13 business days.
GeneralAire AC-1 Filter 20x24x5 MERV 13 (2 PACK)
Our Price: $60.00
Retail: $80.00
You Save 25%!

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GeneralAire FP2025X5 MERV 8 AC Filter Media
(4526)

The GeneralAire FP2025X5 MERV 8 AC Filter Media is a flatpac expandable replacement filter with a MERV 8 rating. This expandable, high capacity, depth loading fiberglass filter that allows for reduced and efficient storage.


In Stock! Ships in 7 to 8 business days.
GeneralAire FP2025X5 MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GeneralAire FP12020X5 MERV 8 AC Filter Media
(4528)

The GeneralAire FP12020X5 MERV 8 AC Filter Media fits all furnaces or air conditioners that require the following size filter: 20" x 20" x 5" This GeneralAire FP12020x5 filter media is rated MERV 8. The GeneralAire FP12020X5 MERV 8 AC Filte


In Stock! Ships in 7 to 8 business days.
GeneralAire FP12020X5 MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GeneralAire AC-1 Filter 20x24x5 MERV 8 (2 PACK)
(FFC20245GAM8)

GeneralAire AC-1 Air Filter 20x24x5 is an economical alternative for the OEM GeneralAire AC-1 Air Filter 20x24x5. This furnace filter is part of the GeneralAire AC-1 Series of Residential Air Cleaner Replacement Filters.


In Stock! Ships in 12 to 13 business days.
GeneralAire AC-1 Filter 20x24x5 MERV 8 (2 PACK)
Our Price: $56.99
Retail: $79.99
You Save 29%!

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Filters Fast MERV 8 20x24x5 Air Filter 2-Pack
(FFC20245GA OKGM)

The FiltersFast MERV 8 20x24x5 Air Filter can be used on Generalaire AC-1, Carrier 31MF020100, Byrant 902BXX020, and air cleaners requiring a 20"x24"x5" filter. These effective air filters remove airborne particles to provide healthier indoor air.


In Stock! Ships in 10 to 11 business days.
Filters Fast MERV 8 20x24x5 Air Filter 2-Pack
Our Price: $60.66
Retail: $69.99
You Save 13%!

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GeneralAire FP2020HW MERV 8 AC Filter Media
(4363)

The GeneralAire FP2020HW MERV 8 AC Filter Media is a replacement air filter for the Honeywell F100F2036 and F100F1020 model air cleaners. The GeneralAire FP2020HW, also known as the GeneralAire 4363, replaces the Honeywell FC100A1011 model. With thi


In Stock! Ships in 7 to 8 business days.
GeneralAire FP2020HW MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GeneralAire 12757 Pleat Spacer Replacement
(4003)

The GeneralAire 12757 Pleat Spacer Replacement fits the following model of air cleaner: GeneralAire AC1 This pleat spacer holds the pleated humidifier filter's pleats open and in place. The GeneralAire 12757 Pleat Spacer Replacement is also kno


Out of stock
GeneralAire 12757 Pleat Spacer Replacement
Our Price: $5.17
Retail: $6.75
You Save 23%!

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General Aire 12762 Filter End Sealer Kit
(4009)

The GeneralAire 12762 Filter End Sealer Kit fits the following model of air cleaner: GeneralAire AC3 This end sealer kit is a genuine GeneralAire replacement part. The GeneralAire 12762 Filter End Sealer Kit is also known as GeneralAire part n


Out of stock
General Aire 12762 Filter End Sealer Kit
Our Price: $4.47
Retail: $9.99
You Save 55%!

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GeneralAire FP1620HW MERV 8 AC Filter Media
(4361)

The GeneralAire FP1620HW MERV 8 AC Filter Media is the correct replacement for the following air filter: Honeywell FC100A1003 This GeneralAire AC filter replacement is a MERV 8 filter. The GeneralAire FP1620HW MERV 8 AC Filter Media specifi


Discontinued Product Read Description.
GeneralAire FP1620HW MERV 8 AC Filter Media
Our Price: $13.28
Retail: $29.99
You Save 56%!

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GeneralAire FP1625HW MERV 8 AC Filter Media
(4362)

The GeneralAire FP1625HW MERV 8 AC Filter Media is a replacement air filter for the Honeywell F100F2002 and F100F1012 model air cleaners. The GeneralAire FP1625HW filter media replaces the Honeywell FC100A1029 and features a MERV 8 rating for captur


Discontinued Product Read Description.
GeneralAire FP1625HW MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GeneralAire FP2025HW MERV 8 AC Filter Media
(4364)

The GeneralAire FP2025HW MERV 8 AC Filter Media is a flatpac expandable replacement filter for Honeywell FC100A1037 filters. For optimum efficiency, General Air 4364 filters should be replaced every 3 months.


Discontinued Product Read Description.
GeneralAire FP2025HW MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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GeneralAire FP1625X5 MERV 8 AC Filter Media
(4527)

The GeneralAire FP1625X5 MERV 8 AC Filter Media is a replacement air filter that fits the MAC1400 air cleaner. The GeneralAire FP1625X5 filter improves your indoor air quality by reducing particulates like dust, dander, allergens, and pollen through


Discontinued Product Read Description.
GeneralAire FP1625X5 MERV 8 AC Filter Media
Our Price: $19.99
Retail: $29.99
You Save 33%!

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Filters Fast - GeneralAire Furnace Filters

" Yes, my order was delivered...Real Quick! I love your company and the prompt service. Thanks! " - Jeryl, Winfield, IA
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