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21.5x26x1 Air Filter Merv 8
21.5x26x1 AC Filter Merv 11
21.5x26x1 Furnace Filter Merv 13
21.5x26x1 Filter Merv 13 Titanium
21.5x26x1 Filter Merv 10 Carbon
21.5x26x1 Filter Merv 8 Carbon 21.5x26x1 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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21.5x26x1 Air Filter

AC Furnace Air Filter 21.5x26x1 -Inches

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Odor Eliminator

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Product Description

Item Model Number: FKFB21.5X26A
Brand: Filter King
Filter size: 21.5x26x1
Actual Size: 21.5 x 26 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, 21.5x26x1 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.

21.5x26x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 21.5x26x1 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.

21.5x26x1 Air Filter

Filter King 21.5x26x1 size air filters are used in systems around your home to keep incoming airflow clean. The air filters consist of a tight mesh weaving that captures irritants but still allows air to pass through smoothly. The process raises your homes indoor air quality and keeps the air inside comfortable and safe to breathe. The air will continue to travel through your filters until they become so dirty that their effectiveness begins to lower.

Dirty air filters are an issue that needs to be addressed as soon as you can before they start causing problems. When your air filters are dirty, then airflow will not be able to travel through them into your home. Without fresh air, the air inside your home will begin to stagnate and dry out over time. The air systems will try to push airflow through the blockage but end up straining themselves in the process. A strained air system is more likely to suffer mechanical damage, and use more energy leading to a rise in billing over time.

Your home will need new air filters installed frequently in order to make sure that the air is coming in smoothly. Filter King offers fresh, new 21.5x26x1 to install into your home’s systems. With our subscription option you could have new air filters come in regularly, with orders of two or more filters being shipped for free. The filters rank as an eight on the MERV scale, which means they are able to block out particles like:

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

21.5x26x1 Furnace Filters

The furnace filters in your home clean out heated airflow before it enters the vents and becomes distributed. These filters grow dirtier over time and begin to cause issues the longer they are not replaced. The dirty air filters are unable to process the incoming heated airflow which leads to a rise in temperatures over time. Your home will also experience problems with heating as the heated air is unable to enters its rooms and warm them up. Order new air filters today and enjoy fresh air free of any problems dirty air filters would bring.