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21x22x1 Air Filter Merv 8
21x22x1 AC Filter Merv 11
21x22x1 Furnace Filter Merv 13
21x22x1 Filter Merv 13 Titanium
21x22x1 Filter Merv 10 Carbon
21x22x1 Filter Merv 8 Carbon 21x22x1 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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21x22x1 Air Filter

AC Furnace Air Filter 21x22x1 -Inches

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Odor Eliminator

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Product Description

Item Model Number: FKFB21X22
Brand: Filter King
Filter size: 21x22x1
Actual Size: 20.5 x 21.5 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, 21x22x1 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.

21x22x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 21x22x1 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.

21x22x1 Air Filter

Filter King 21x22x1 size air filters are available for purchase and installation from Filter King. The tools are valuable assets for home air systems to clean up incoming airflow so that the air coming in does not pollute your home. The filters consist of a tight mesh weaving that is able to allow airflow to pass while at the same time blocking out harmful irritants. The filtration process raises indoor air quality and keeps the airflow coming inside safe and clean. The filters become dirtier in the process and eventually require replacement in order to keep the system functioning properly.

The air filters in your systems become dirtier over time, eventually their mesh weaving become completely covered in captured particles.The most pressing issue that results from having dirty air filters is the blockage of airflow. When fresh airflow is prevented from entering your home, it results in problems of dryness and stagnation. Your home air systems also become strained as they struggle to push airflow through. Strained air systems often require expensive repairs over time, and your energy billing only rises over time the longer the dirty air filters are in your systems.

When you install new air filters the airflow is allowed in consistently and without issue. Filter King is able to provide fresh new 21x22x1 size filters at affordable prices. Our subscription service has new air filters arrive at a regular rate, with orders of two or more filters being delivered for free. Filter King filters rate as an eight on the MERV (Minimum Efficiency Reporting Value) scale. Meaning that they filter out particles like:

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

21x22x1 Furnace Filters

Furnace air filters are tools used by their systems to keep the incoming airflow clean. Furnace filters need frequent replacement or there are multiple issues that come up inside your home. Dirty furnace filters block out heated airflow, which leads to temperature problems as the heat begins to build up. Your home also sees temperature fluctuations since the heated airflow is unable to come through your vents. Avoid these problems, order new air filters today from Filter King and keep the air coming in clean.