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Custom Air Filters

Start by selecting the filter dimensions, noting that the height refers to the smaller measurement. Then, choose the MERV rating that corresponds to the desired level of filter performance. Please make sure that you enter the correct dimensions below as we do not allow returns on custom air filters.More information

Select Filter Dimensions

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Qty
(6 filters per case )

Select Your Filter Quality

Ships in 2 business days

 

FiltersFast.com offers high-quality, great-value air filters that are rigorously tested with sensitive lab equipment to ensure they meet MERV standards, made with durable pleated media and completely free of fiberglass. Don't just take our word for it—check out our customer reviews to see why people trust FiltersFast.com!


Customer Reviews:

Total Reviews: 488 Average Rating: 4.75 / 5.0

Filtersfast Reviews on Trust Pilot external site
Robert Brown2026-06-09

The service was was more than I expected. they arrived quickly with no problems.

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Robert Edwards2026-06-03

Arrived as promised. Size was exact and worked perfectly. Costly but have to have product. Will be back in a year or so for more.

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customer2026-05-31

Correct stuff and done fast.

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Johnna L Manning2026-05-24

This is my email address. This order was for my sister in law and brother. I have ordered several times for them, so I assume they are happy with your product. Was up at their home when they received these. Knowing my brother, he would not allow me to keep ordering if he was not happy with your product. Thank you.

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customer2026-05-23

Fits great/filters great!

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Gino2026-05-23

Very quick and simple process

Collected by Trustpilot.com
Joanne Flood2026-05-13

Perfect fit and arrived quickly!

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juliet dreggors2026-05-01

Thank you for great customer service.

Collected by Trustpilot.com
Jack Clark2026-04-26

A good fit, obvious high quality

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Scott Schofield2026-04-26

Great filters, only place I could find my size

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Thomas Morse2026-04-21

Very good filters!

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Gregg Schwartz2026-04-20

Great filters & great staff.

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John2026-04-20

Fits perfectly

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ERNEST2026-04-07

Okokokokokok

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Stuart2026-03-30

Once this company gets you on their e-mail list, they'll never leave you alone. You'll get bombarded with daily advertisements until you scream to be taken off their list. They just don't know when to stop. I have enough filters to last me the rest of my life, but they insist on clogging my e-mail file to the point where I finally had to call them and literally scream at them. They just don't know when to stop. Other than that, it's a great company. They have good products at an excellent price with fast service, but beware of their over-zealous advertising. One e-mail a month is more than I can take, but these people will flood your computer with advertising to the point where I now hate them. This is NOT the way to win customers and make friends. Even after they promised to remove me from their list, I still get e-mail messages. If they're not advertising, they're taking surveys. That's their sneaky way to keep their name in front of your eyes. If you have nothing better to do than delete their e-mails, buy their filters. Otherwise, get ready to have your e-mail box stuffed to the maximum on a daily basis.

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Tyanne Ryan2026-03-22

Too expensive and you send our way too many emails. One a month is reasonable.

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Martin Clague2026-03-13

thanks for the custom fitting option it really helps

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Jose Olivares2026-03-10

Ordering went very well. Very polite representative. Filters are good quality and well-ordered again. Thank you.

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customer2026-03-09

not pleased

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Gerald Protzman2026-03-09

Thank you. Just right size.

Collected by Trustpilot.com

Please Note

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Our custom filter sizes are currently available in depths of 1", 2", and 4". Please make sure that you enter the correct dimensions below as we do not allow returns on custom air filters. Sizes are available in increments of 1/8th of an inch, and are sold in cases of 6 filters.

When ordering a custom size filter, make sure that you select dimensions that will fit the opening. Custom filters are manufactured to the exact size that you specify (allowing for 1/8" tolerance of each side). We will prompt you if the size you select meets the dimensions of a standard size filter. Read more

Filters Fast custom filter sizes are currently available in depths of 1", 2", and 4". Please make sure that you enter the correct dimensions in the drop down boxes. X and Y sizes are available in increments of 1/8th of an inch, and the filters are sold in cases of 6 filters.

Terms:
Nominal Size: The printed value of a filter dimension. (15"x20"x1")
Actual size: Actual or real sizes of filters are typically .5" less than the printed dimension or nominal value listed on the filter. A filter of 20"x24" would be 19.5"x23.5"

Step 1. Select your Merv rating.
In this step you will tell the system which Merv rating you want to create your filter from...

Step 2. Select the Depth of filter.
Once you have selected your Merv rating you are ready to select the depth of the filter...

Step 3. Select the Height and Width dimensions.
Now it's time to specify the height and width of your custom filter...

Step 4. Select the number of cases.
This is the last step. Now select the number of cases that you want to order...

You will notice that there is a box to the right of the height and width drop down boxes that says "Custom Size"...

Close Healthier Indoor Air Quality

Filters Fast MERV Air Filters effectively reduces pollen, dust, pet dander, mold spores, dust mites and other allergens from indoor air. Removing these airborne particles can help improve allergies and alleviate sinus irritation that can cause watery eyes, itchy throat, coughing, and sneezing. Filters Fast Merv 8, 11, and 13 furnace filters, AC filters are now available.

Green Technology

The Filters Fast MERV air filter meets the Green Building Council's latest LEED (Leadership in Energy and Environmental Design) Indoor Air Quality Requirements for occupant health. That makes this filter a quick and efficient way to achieve points toward your company's LEED Certification. And in case you didn't know LEED certification can earn you tax breaks, which is just one way this filter can save you money!

Efficiency

MERV, or Minimum Efficiency Reporting Value, indicates when a filter will be least efficient. So the higher the MERV rating, the more efficient the filter. It should be noted that most fiberglass spun filters such as those found in your local grocery store are usually only a MERV 1 or MERV 2. This can affect the efficiency and air flow of your heating and cooling system, causing it to work harder to produce the same air flow and costing you more money! The Filters Fast MERV 8, 11, and 13 Filter features a low pressure drop, which means less impact on your energy use, which again will save you money!

Quality Construction and Capacity

The Filters Fast MERV 8, 11, and 13 filter is constructed of a galvanized, corrosion resistant metal support grid and 100% electrostatically charged synthetic graded density media. The media used is resistant to a wide range of chemicals and will not absorb moisture, which can support microbial growth.

The Filters Fast MERV 8, 11, and 13 filter's pleats are designed in a way to promote maximum surface area and dust holding capacity. The pleats are actually bonded to the frame to prevent any dust bypass. This means higher efficiency and air quality. These filters have 15 pleats per lineal foot which creates a greater surface area to catch airborne particles than standard filters. That also means that in most cases you don't have to change them as frequently!

Merv Chart Close Window
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