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20.75x21.75x1 Air Filter Merv 8
20.75x21.75x1 AC Filter Merv 11
20.75x21.75x1 Furnace Filter Merv 13
20.75x21.75x1 Filter Merv 13 Titanium
20.75x21.75x1 Filter Merv 10 Carbon
20.75x21.75x1 Filter Merv 8 Carbon 20.75x21.75x1 Filter Merv 8 Carbon
Protects All Against
  • Pollen protection
  • Dust protection
  • Mold protection
  • Dust Mites protection
    Dust Mites
  • Bacteria protection
  • Pet Dander protection
    Pet Dander
  • Smoke protection
  • Viruses protection
  • Cooking Smoke protection
  • Odor protection
  • Smog protection
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20.75x21.75x1 Air Filter

AC Furnace Air Filter 20.75x21.75x1 -Inches

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Product Description

Item Model Number: FKFB20.75X21.75A
Brand: Filter King
Filter size: 20.75x21.75x1
Actual Size: 20.75 x 21.75 x .75
1-Inch Filter
MERV 8 Filter Rating
Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander, Smoke, Viruses
Residential / Commercial Use

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 20.75x21.75x1 pleated air filters are at least 20 times more effective. All Filter King air filters are made in the US.


Filters frames are made out of heat resistant paperboard with horizontal grid supports. Able to withstand temperatures of up to 200° F and resistant to moisture, the paperboard frames do not support microbial growth and outperforms traditional cardboard frames.


Chemical free, electrostatically charged synthetic polyester media is pleated, maximizing the surface area, to capture a high number of airborne particles as small as 0.3 microns with low air flow resistance. To increase durability, the media is supported with a corrosion resistant steel wire.

20.75x21.75x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 20.75x21.75x1 Air Filter?

Filter King AC & furnace filters aren’t the typical fiberglass filters that need to be replaced every 30 days. Our filters can typically be used for 3 to 5 months before requiring to be changed. Naturally, a variety of things influence filter lifespan.

Some of the factors that influence your filter’s life include outdoor air quality, whether pets are in the home, and how well your HVAC system is maintained.

Your air filter becomes clogged over time by trapped particles, preventing airflow. The efficiency of the HVAC filter declines. Your system must work harder to heat and cool your home. The extra strain on the HVAC system causes higher energy bills. Regular home air filter replacements can prevent expensive system repairs or replacements down the road.

You should change your filter more frequently if you notice:

  • Household dust build-up
  • The air isn’t cooling as is used to
  • There’s more dust near the air vents
  • A dirty filter surface
  • Higher energy bills
  • Burning smells near your HVAC system.

20.75x21.75x1 Air Filter

Filter King 20.75x21.75x1 size air filters are necessary parts of your air systems, used to clean up passing airflow. The air systems throughout your home are constantly bringing in fresh airflow, but they have no way to differentiate the clean air from the dirty. Air filters are the tool used to clean out fresh air so that it does not bring in any allergens or pollutants. Your home’s indoor air quality is reliant on how well incoming airflow is filtered. Air filters keep the air in your home comfortable and safe to breathe, but they will grow dirtier over time.

The air filters in your home will cause problems for their system when they become dirty, and eventually cause problems for your whole home. Fresh air flow is necessary for your home in order to keep the air inside from stagnating or drying out over time. Your air systems will also become strained as they struggle to push airflow past the blockage. The continuous strain will eventually cause mechanical damage, a costly expense on top of the additional energy billing. New air filters will help prevent these issues from developing over time and keep air coming in smoothly.

The filters in your home need regular replacement in order to make sure that the air coming in is kept clean. We offer new 20.75x21.75x1 size air filters ready for installation upon arrival via our delivery service. Orders of two or more filters are shipped for free, while our subscription option has new air filters delivered as often as monthly. Filter King offers filters that have a MERV (Minimum Efficiency Reporting Value) rating of eight, meaning they are capable of blocking out particles like:

  • Pollen
  • Dust
  • Mold
  • Dust Mites
  • Bacteria
  • Pet Dander
  • Smoke
  • Viruses

20.75x21.75x1 Furnace Filters

The furnace filters in your air systems keep heated airflow clean before distribution throughout a system. The filters grow dirtier over time, which is a problem for your home when the temperatures begin to build. Heated airflow needs release or the resulting heat fluctuations will only grow worse over time. Purchase new air filters today to keep airflow coming in smooth and clean.