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10x20x4 Air Filter Merv 8 10x20x4 Air Filter Merv 8
10x20x4 AC Filter Merv 11 10x20x4 AC Filter Merv 11
10x20x4 Furnace Filter Merv 13 10x20x4 Furnace Filter Merv 13
10x20x4 Filter Merv 13 Titanium 10x20x4 Filter Merv 13 Titanium
10x20x4 Filter Merv 10 Carbon 10x20x4 Filter Merv 10 Carbon
10x20x4 Filter Merv 8 Carbon 10x20x4 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

10x20x4 Air Filters

(Actual Size: 9.5 x 19.5 x 3.75)

Actual size info The nominal size is the size rounded to the closest whole or half an inch. The actual size is the precise physical size of the filter. Learn more.

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2. Select Quantity of 10x20x4 Air Filters

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Product Description

AC Furnace Air Filter 10x20x4 -Inches

Item Model Number: FKFB10X20X4
Brand: Filter King
Filter size: 10x20x4
Actual Size: 9.5 x 19.5 x 3.75
4-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, 10x20x4 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.

10x20x4 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 10x20x4 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.

20x27x1 Air Filter

Filter King 20x27x1 size air filters are used by the average home’s air systems as tools necessary to cleaning out incoming airflow. The process keeps indoor air quality up as the filters prevent entry to several types of particles. The air surrounding your home may contain any number of allergens or pollutants. Air filters are the tools used to make sure that pollutants do not fill your home. Your air filters become dirty in the process, and require maintenance before they start causing problems throughout your home.

The air filters installed in a system will continue to clean out airflow until they become covered in particles. Dirty air filters are unable to properly let air through, which leads to dryness and stagnation for the air inside your home. Your air systems become strained as well, they are under increasing pressure as they try to push airflow past the blockage. Over time, the effort will lead to mechanical damage, costly repairs, and a rise in energy billing.

The air filters in your home need consistent maintenance in order to keep the airflow coming in without problems. Filter King offers fresh 20x27x1 size air filters ready for use upon arrival at your home. We also have a delivery service, with a subscription option that has new air filters shipped out as often as monthly. Orders of two or more filters are shipped out for free. Filter King model filters have a MERV (Minimum Efficiency Reporting Value) rating of eight, and filter out particles like:

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

20x27x1 Furnace Filters

Furnace air filters are necessary to their system and keep heated airflow from bringing in any pollutants. The filters become dirtier over time, which is a problem considering the airflow passing through is heated. When heated airflow stops, temperatures rise, and this leads to possible mechanical damage. Your home will also suffer from temperature fluctuations since there is a problem with the heating. Order new air filters now and enjoy fresh, warm airflow for your home.