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Air Filter Shield

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.


Air Filters full product list:


Honeywell HF100F1625 16x25x4 Replacement for Honeywell F100F2002
(F100F2002)

The Honeywell F100F2002 16x25 Whole House Air Cleaner uses a high efficiency filter that captures airborne particles in the air circulated through the unit, as small as 0.3 microns.

Free shipping within the continental United States!

Special Order. Ships in 9 days.
Honeywell  HF100F1625 16x25x4 Replacement for Honeywell F100F2002
Our Price: $106.99
Retail: $149.99
You Save 29%!

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Goodman GDMHEPA400 Whole House HEPA Air Purifier
(GDMHEPA400)

The Goodman GDMHEPA400 Whole House HEPA Air Purifier is a high-efficiency air purifier is a True HEPA air cleaner that is engineered to improve the quality of indoor air.

Free shipping within the continental United States!

Special Order. Ships in 3 days.
Goodman GDMHEPA400 Whole House HEPA Air Purifier
Our Price: $340.99
Retail: $399.99
You Save 15%!

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Trion 22x16 Charcoal Filter - 227833-002
(227833-002)

The Trion 22x16 Charcoal Filter - 227833-002 measures 22" x 16" and fits select air cleaner models from Trion. This Trion filter is constructed with activated charcoal which absorbs odors and cleans air. This Trion air filter replacement filter shou


Special Order. Ships in 3 days.
Trion 22x16 Charcoal Filter - 227833-002
Our Price: $42.12
Retail: $49.99
You Save 16%!

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Trion 227833-006 Charcoal After Filter for HE20x20
(227833-006)

The Trion 227833-006 Charcoal After Filter for HE20x20 is a replacement charcoal filter for the Trion HE20X20 Electronic Air Cleaner. This Trion filter replacement features activated charcoal for the removal of airborne odors in your home. This acti


Special Order. Ships in 3 days.
Trion 227833-006 Charcoal After Filter for HE20x20
Our Price: $66.99
Retail: $69.99
You Save 4%!

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Trion 227833-010 FM 500E Charcoal Filter
(227833-010)

The Trion 227833-010 FM 500E Charcoal Filter is a replacement charcoal filter for the Trion FM500EElectronic Air Cleaner. This Trion filter replacement features activated charcoal for the removal of airborne odors in your home. This activated charco


Special Order. Ships in 3 days.
Trion 227833-010 FM 500E Charcoal Filter
Our Price: $26.13
Retail: $29.99
You Save 13%!

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Trion 320283-001 17x4 Charcoal Filter
(320283-001)

The Trion 320283-001 17x4 Charcoal Filter is a replacement air filter for select Trion air cleaner models. This Trion air filter replacement features activated charcoal for the removal of airborne odors in your home. This activated charcoal filter s


Special Order. Ships in 3 days.
Trion 320283-001 17x4 Charcoal Filter
Our Price: $24.51
Retail: $29.99
You Save 18%!

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Trion 320283-002 TTM33 Charcoal Filter
(320283-002)

The Trion 320283-002 TTM33 Charcoal Filter is a replacement air filter for the Trion TTM33 that measures 18" x 24". This Trion filter features activated charcoal which absorbs unpleasant odors in your air so you can breathe easily. This activated ch


Special Order. Ships in 3 days.
Trion 320283-002 TTM33 Charcoal Filter
Our Price: $61.27

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Trion 320283-003 19x19 Charcoal Filter
(320283-003)

The Trion 320283-003 19x19 Charcoal Filter measures 19" x 19". This Trion air filter replacement features activated charcoal which absorbs unpleasant odors in your air so you can breathe easily. This activated charcoal air filter should be replaced

Free shipping within the continental United States!

Special Order. Ships in 3 days.
Trion 320283-003 19x19 Charcoal Filter
Our Price: $94.97
Retail: $99.99
You Save 5%!

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Magnetic Vent Cover HVAC Air Filter 4x18 100-Pack
(MAGNETIC VENT 4X18)

Add a durable and reusable barrier of protection from hair, dust, and bugs with an easy to install 4x18 Magnetic Vent Cover HVAC Air Filter. Constructed from a soft PVC grid using a polypropylene mesh the filter attaches to your metal register.


Special Order. Ships in 9 days.
Magnetic Vent Cover HVAC Air Filter 4x18
Our Price: $1,095.00

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Magnetic Vent Cover HVAC Air Filter 8x18 70-Pack
(MAGNETIC VENT 8X18)

Some of the best things in life are simple, like a washable 8x18 Magnetic Vent Cover HVAC Air Filter that installs in no time at all and prevent pesky hair, dirt, and bugs from going into or leaving your air vents.


Special Order. Ships in 9 days.
Magnetic Vent Cover HVAC Air Filter 8x18
Our Price: $976.50

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Holmes HAPF21, 9000436 Replacement Filter
(HAPF21)

The Holmes HAPF21 Replacement Filter is the main HEPA filter in Holmes models HAP222, HAP221, HAP220, HAP223, and HAP2234. Also known as part number HAPF21CS.


In Stock! Ships in 8 to 9 business days.
Holmes HAPF21, 9000436 Replacement Filter
Our Price: $11.00

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Holmes HAPF22, 9000439 HEPA Replacement Filter
(HAPF22)

The Holmes HAPF22, 9000439 HEPA Replacement Filter is a HEPA filter with an activated carbon layer, great for trapping microscopic allergens & dust. Made for use in Holmes models HAP220, HAP221, HAP223, and HAP2234.


In Stock! Ships in 3 to 4 business days.
Holmes HAPF22, 9000439 HEPA Replacement Filter
Our Price: $14.99

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3M Filtrete 4 Inch Allergen Reduction Filter
(4 inch Allergen)

3M Filtrete Allergen Reduction Filter for Media Air Cleaners are the smart choice if you're looking to upgrade or retrofit the air filter in your existing HVAC system. Captures 97% of large airborne allergens like pollen, mold spores, & dust mites.


In Stock! Ships in 3 to 4 business days.
3M Filtrete 4 Inch Allergen Reduction Filter
As Low As: $62.32
Retail: $69.99
You Save 11%!

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Honeywell Replacement HEPA Filter, 21500
(21500)

The Honeywell 21500 Replacement HEPA Filter fits Honeywell models 50150, 51500, 83330, 61500, 11500 Series, 18150 Series, 11520 Series, and 17200 Series. Genuine Honeywell part.


In Stock! Ships in 9 to 10 business days.
Honeywell Replacement HEPA Filter, 21500
Our Price: $73.99
Retail: $79.95
You Save 7%!

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3M Filtrete 4 Inch Allergen Media Filter 4-pack
(4 inch Allergen 4-pack)

3M Filtrete Allergen Reduction Filter for Media Air Cleaners are the smart choice if you're looking to upgrade or retrofit the air filter in your existing HVAC system. Captures 97% of large airborne allergens like pollen, mold spores, & dust mites.

Free shipping within the continental United States!

In Stock! Ships in 3 to 4 business days.
3M Filtrete 4 Inch Allergen Media Filter 4-pack
Our Price: $130.00
Retail: $146.00
You Save 11%!

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Holmes HWF100 Humidifier Replacement Filter 3-Pack
(HWF100)

Holmes, Harmony Humidifier HWF100 Humidifier Filter features Microban technology and is designed for use with Humidifier Models: HM630, HM729, HM4600, HM6000, HM6000RC, HM6005, HM6600, HM7204, HM7305, HM7305RC, HM7306, BCM645, BCM5520RC, and more...


In Stock! Ships in 7 to 8 business days.
Holmes HWF100 Humidifier Replacement Filter 3-Pack
Our Price: $15.00
Retail: $17.00
You Save 12%!

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Holmes HWF65 Replacement Humidifier Filter
(HWF65)

Holmes HWF65 Humidifier Filter features Microban technology and is designed for use with Humidifier Models: HM1800, HM1840, HM1845, HM1850, HM1851, HM1855, HM1865, HM1888, HM1889, HM1895, HM2059, HM2060, HM2060W, HM3000, HM3800, HM3850, and more..


In Stock! Ships in 3 to 4 business days.
Holmes HWF65 Replacement Humidifier Filter
Our Price: $16.99
Retail: $20.00
You Save 15%!

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Holmes HWF75 Humidifier Filter - HM1700, HM1280
(HWF75)

Holmes HWF75 Humidifier Filter features Microban technology and is designed for use with Humidifier Models: HM3500, HM3600, HM3640, HM3641, HM3650, HM3655, WWH3300, and WWHM3600.


In Stock! Ships in 2 to 3 business days.
Holmes HWF75 Humidifier Filter - HM1700, HM1280
Our Price: $20.99

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FiltersFast Custom Size Air Filters 6 Pack
(FFCAF)

FiltersFast Air Filters are an economical alternative if you're looking for a quality air filter without paying a premium price! FiltersFast Air Filters are now available in custom sizes! View details for order guidelines.


In Stock! Ships in 1 to 2 business days.
FiltersFast Custom Size Air Filters 6 Pack
Our Price: $41.00

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

The FiltersFast 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 3 to 4 business days.
FiltersFast GeneralAire Compatible 20x24x5, 2-pack
Our Price: $49.25

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FiltersFast MERV 11 Return Grille Air Filter 5"
(FFRAGF)

The FiltersFast MERV 11 Return Grille Air Filter 5" are a great option for upgrading or replacing the traditional 1-inch air filter found in your home or office. View details to learn more...


In Stock! Ships in 3 to 4 business days.
FiltersFast MERV 11 Return Grille Air Filter 5"
Our Price: $30.99
Retail: $39.99
You Save 23%!

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FiltersFast MERV 13 Return Grille Air Filter - 5"
(FFRAG13)

Protect your health, your environment and your wallet with a FiltersFast MERV 13 Return Grille Air Filter. MERV 13 is one of the highest efficiency ratings available, and FiltersFast now offers this rating in a 5" Return Air Grille application.


In Stock! Ships in 3 to 4 business days.
FiltersFast MERV 13 Return Grille Air Filter - 5"
Our Price: $40.99
Retail: $49.99
You Save 18%!

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Hunter 30928 HEPAtech Purifier Filter
(30928)

The Hunter 30928 HEPAtech Purifier Filter is an electrostatically-charged filter that captures 99.9% of particles as small as 0.1 microns.


In Stock! Ships in 9 to 10 business days.
Hunter 30928 HEPAtech Purifier Filter
Our Price: $35.95
Retail: $39.95
You Save 10%!

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Hunter 30940 QuietFlo HEPA Purifier Filter
(30940)

The Hunter 30940 QuietFlo HEPA Purifier Filter is an electrostatically-charged filter that captures 99.9% of particles as small as 0.3 microns. This is a true HEPA filter and a genuine OEM Hunter part.


In Stock! Ships in 8 to 9 business days.
Hunter 30940 QuietFlo HEPA Purifier Filter
Our Price: $80.99
Retail: $82.94
You Save 2%!

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Hunter 30943 QuietFlo HEPA Purifier Filter
(30943)

The Hunter 30943 QuietFlo HEPA Purifier Filter is an electrostatically-charged filter that captures 99.9% of particles as small as 0.3 microns.


In Stock! Ships in 3 to 4 business days.
Hunter 30943 QuietFlo HEPA Purifier Filter
Our Price: $65.95
Retail: $69.95
You Save 6%!

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Filters Fast - Air Filters

" Thank you for your expert service when helping me get the proper filters for my old pool and filter system. The new ones are perfect and work very well. All the best! " - Jim, Alamo, CA
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