Exact Filters

21-3/8x8-1/8x1 Exact Filters Pleated MERV 13 (12 pack)

$ 255.99
$ 255.99
Shipping calculated at checkout.

Made in the Exact Size!

Exact Filters are made to order to ensure a perfect fit for your HVAC system. These filters will have the final dimensions of 21 3/8 x 8 1/8 x 3/4 inches. Say goodbye to air bypass and the hassle of searching for a filter that matches your system. Backed by the Filter Fit Guarantee, you can trust that your Exact Filters will provide optimal performance.

21-3/8x8-1/8x1 Exact Pleated MERV 13 Filters (12-pack). These high-quality filters are designed to provide exceptional air filtration for your home or office. With a MERV 13 rating, they effectively capture airborne particles such as dust, pollen, pet dander, mold spores, and more. The exact size pleated design ensures maximum surface area for optimal filtration efficiency, helping to improve indoor air quality and reduce allergens. Each pack contains 12 filters, providing you with a convenient supply to last for an extended period. Upgrade your air filtration system with our MERV 13 filters for cleaner, fresher air!
  • Low resistance MERV 13 media, providing higher DHC than competitive standard capacity filters
  • High efficiency. Our highest MERV rating available for exact filters.
  • 100% synthetic recyclable high-loft media
  • 2-piece heavy-duty die-cut frame
  • Ecologically friendly frame components made from recyclable materials
  • Expanded metal grid prevents media flutter while in operation
  • Superior frame strength due to diagonal and horizontal support members, as well as wire-backed media
  • Filter media pack is sealed to eliminate air bypass
  • For peak equipment protection and energy efficiency, these filters should be changed every 3 months in periods of high use
  • Pleated disposable filters are made by a leader in indoor air filtration
  • 12 Filters
Be sure you have measured your existing filter before placing an order, some manufacturers undercut filters so you should never base it off the label. Exact/custom filters are not eligible for returns or exchanges. Manufacturing tolerances of plus 0, minus 1/8" will be observed on overall width and length of filter. Picture is used as a reference, sizes will vary. Filters larger than 25x30x1 are considered a double filter where there is additional strength down the middle of the filter. It's our policy to list the smallest dimension first. When the filters arrive the label will be displayed as such, this will not impact compatibility - it's just a matter of how you hold the filter. If you have questions or concerns please contact us.

Specifications

Nominal Size

21 3/8 x 8 1/8 x 1 inches

Actual Size

21 3/8 x 8 1/8 x 3/4 inches

MERV Rating

MERV 13

Filter Media

100% synthetic non-woven, proprietary media that can be recycled. Engineered with a gradient density composition that achieves it's MERV rating using the mechanical method of particle capture. Media does not rely on an electrostatic charge to capture particulate, since electrostatic charged filters dissipate over time.

Filter Support Grid

Expanded metal is continuously laminated on the air leaving side to provide pleat stability during operation. Pleat shape is maintained allowing full media utilization which improves dust holding capacity.

Frame

Heavy-duty, two piece, moisture-resistant frame with diagonal support members. Frame is bonded to the media at all points of contact for unsurpassed frame strength. Interlocking corners and positive media-to-frame seal reduce the possibility of air bypass.

Removes

MERV 13 rating reduces up to 95% of airborne particles including dust and lint, dust mite debris, pollen, pet dander, mold spores, bacteria, microscopic allergens, virus carriers, most smoke, smog, oil smoke, as well as lead dust. Hospital-grade air filtration provides maximum protection for your home or business.

Life

Recommended 90 day changeout

Quantity

12 Filters

Part Number

MERV 13 - 21 3/8 x 8 1/8 x 1 - E
21-3/8x8-1/8x1 Exact Filters Pleated MERV 13 (12 pack)

$ 255.99

Quick Facts
21-3/8x8-1/8x1 Exact Filters Pleated MERV 13 (12 pack)

  • 21 3/8 x 8 1/8 x 1 inches

  • Filter Fit Guarantee

  • MERV 13

  • Free Shipping

Give us a call

We are happy to help over the phone at 1.866.469.8556, Monday-Friday (Pacific Time)

Free Shipping

When you spend $50+ in the domestic U.S. We offer great rates to Hawaii, Alaska and Canada.

U.S. Based Support

Support from real humans based in the United States.

General

How often should I replace my HVAC filter?

Most pleated filters should be changed every 90 days. However, households with pets, allergies, or heavy HVAC use may need to replace filters every 30–60 days. Commercial and industrial sites may require more frequent changes based on conditions.

Do you offer custom sizes?

Yes! If you need a filter with an exact size—down to the 1/8 inch—we can help. Visit our Custom Size Filters page to get started.

What if the filter doesn’t fit right?

We’ve got you covered with our Filter Fit Guarantee. If the size doesn’t fit your system as expected, reach out to our support team and we’ll make it right.
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What makes you different from big box stores or other filter sites?

We’ve been online for nearly 20 years, and our team has over 50 years of combined HVAC experience. We sell American-made filters from trusted brands like AAF Flanders and Koch Filter—no cheap knockoffs or low-performance imports. We’re also a proud NAFA member, which means we’re committed to real air quality expertise and professional standards.

Do you sell the same filters used in commercial or government buildings?

Yes. In fact, we supply filters to schools, clinics, and government agencies nationwide. Many of our filters—especially MERV 10, 11, and 13—meet or exceed specifications for professional use. You’re getting professional-grade protection for your home.

Are your filters certified or tested?

Yes. Almost all of our filters meet or exceed ASHRAE standards and are manufactured under strict quality control. Many are used in hospitals, schools, and government facilities—so you can trust they perform as advertised.

How do I know what size filter I need?

Look for the size printed on your old filter or measure the filter slot in your system. We recommend rounding up to the nearest 1/8” for custom sizes. You can also visit our How to Measure Filters page for step-by-step help.

Do you offer bulk discounts or commercial pricing?

Absolutely. If you’re ordering for a business, property, or large facility, we’ll provide a quote and recommend the right products for your needs. Reach out to our Commercial Services team anytime.

What is MERV?

What is a MERV rating and why does it matter?

MERV (Minimum Efficiency Reporting Value) rates how well a filter captures airborne particles. The higher the MERV rating (typically 1–13 for residential use), the finer the particles it can trap—from dust and pollen to bacteria and smoke. We offer filters from MERV 1–13 to match your system’s needs and your air quality goals. Learn More

Will a higher MERV rating restrict airflow?

Filters with higher MERV ratings are denser and can reduce airflow in systems not designed for them. MERV 8–10 is a safe choice for most homes. For MERV 11 or 13, ensure your system can handle the increased resistance or contact our team—we’re happy to help you choose the right balance of efficiency and airflow.

Will using a high-MERV filter damage my HVAC system?

Not when matched properly. All of our filters are designed for low pressure drop and optimal airflow. If you’re unsure, contact us—we’ll help you choose a filter that your system can handle safely.

Do higher MERV filters improve indoor air quality?

Yes. Filters with higher MERV ratings (10–13) trap smaller and more harmful particles like mold spores, smoke, bacteria, and allergens. They’re ideal for families, people with asthma or sensitivities, and anyone wanting cleaner, healthier air inside.

Questions about this filter?
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