The perfect fit with 100% filtration.

Breathe Clean Air!

With a frame and filters that are made for your AC so you can..

  • Breathe and sleep better
  • Increase AC unit life
  • More affordable than store-bought filters
  • 10 year warranty
  • Free Shipping

    on all orders in the US

  • Guaranteed

    Love it within 60 days or your money back!

  • Huge Savings

    at lowest price

  • Long Warranty

    10 years on frame

Air purifier. Air filter icon. Solid Particle and Bacterial Filter. Vector Illustration.
Untitled design

Better Than Store-Bought Filters

The air in your home should be 100% filtered. Besides the health risks of low quality air, it decreases the life of your AC unit as well. Clean air means a longer-lasting AC unit, easier breathing and better sleep!

Filters that are bought in-store have a cardboard frame, which never seals properly and can bend or crush. This allows unfiltered air to escape around gaps and contaminate your AC unit.

Custom Fit frames and filters for your AC or furnace solve the problem of air escaping through gaps. You keep the frame in place and replace the AC filters for the highest quality air at the lowest cost!

The average cost of store-bought filters: $140/year
The average cost of Custom Fit Filters: $73/year

The Science of A Custom-Fit Filter

  • Patented air frame technology

  • Made of aluminum - won't crush like a cardboard frame


  • Electrostatically-charged mesh to collect ultra-fine particulates like dander and mold spores
  • Doesn't bend or crush like cardboard filter frames
  • Creates a seal to ensure 100% of your air is filtered.

How It Works


Measuring is EASY!

Take your current filter out and measure the opening according to our instructions.


After you measure according to our instructions, you're ready to place your order!

We'll get your order in the mail the next day

Install The Frame


Your new CustomFit frame will be delivered with a CustomFit filter loaded and ready to snap in to your existing AC filter opening, no assembly required!

Replace Filters Every

60-90 Days

You keep the CustomFit aluminum frame with electrostatic mesh.

Replace your CustomFit Filter as directed (60-90 days)

Purchase The Frame Once

You Only Purchase Refills After


I believe Custom Fit Filters are some of the best for the price range. We have tile floors, a dog and a cat but with these filters you do not notice any odor throughout the AC. Although we usually replace monthly you may not need to do as often, it is recommended to do every 3 months. These were received exactly as ordered and arrived quickly.

- Ada Jordan

Custom Fit Filters



Effective against:

  • Lint, Dust & Debris
  • Pollen & Mold Spores
  • Pet Dander, Mildew & Bacteria
  • 30 day money back guarantee
bisponge in frame



Effective against:

  • Lint, Dust & Debris
  • Pollen & Mold Spores
  • Pet Dander
  • 30 day money back guarantee
Microsponge in frame



Effective against:

  • Lint, Dust & Debris
  • Pollen & Mold Spores
  • Pet Dander
  • Auto Emissions & Smoke
  • Bacteria & Tobacco Smoke
  • 30 day money back guarantee
MicroSponge_ MERV 14
2021-02-18 10_34_13-BioSponge® Plus Air Filter Refills

You're Spending More On Store-Bought Filters!

Custom fit filter refills

Excellent filter. The custom fit ensured there were no gaps. Rarely have a need to dust horizontal surfaces in the house.

- John Page

The Custom Fit Difference

  • Energy Savings
  • Less dusting
  • Relief from allergies
  • Disposable and frameless
  • Easy to install in your permanent custom-made frame
  • Up to MERV 14 - even filters out bacteria from your home's air

Meet other individuals who have enjoyed their custom fit filters just as much as you will!

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