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18x24x1 Air Filter Merv 8
18x24x1 AC Filter Merv 11
18x24x1 Furnace Filter Merv 13
18x24x1 Filter Merv 13 Titanium
18x24x1 Filter Merv 10 Carbon
18x24x1 Filter Merv 8 Carbon 18x24x1 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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18x24x1 Air Filter

AC Furnace Air Filter 18x24x1 -Inches

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Product Description

Item Model Number: FKFB18X24
Brand: Filter King
Filter size: 18x24x1
Actual Size: 17.5 x 23.5 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, 18x24x1 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.

18x24x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 18x24x1 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.

18x24x1 Air Filter

The Filter King 18x24x1 air filter is a necessary tool for any HVAC system, keeping clean air coming in while airborne irritants stay out. The small particles in the air surrounding your home consist of a wide range of allergens, dirt, and debris capable of affecting the air inside your home. The air filters prevent the entry of irritants, they consist of tight mesh weaving designed to trap and absorb particles passing through inside the airflow. The filters keep irritants from affecting the air inside your home and in the process become dirty enough to cause problems themselves. Your air filters only become dirtier over time and will require replacement before they start causing serious problems throughout your home.

Air Filter Use for Residential Homes

A residential home’s air systems are constantly pumping in fresh airflow, but without filtration, it may not make your home smell clean or fresh. The airflow coming in may contain allergens or pollutants that are capable of filling your duct system and then affecting the indoor home's air quality. Your air systems are unable to tell the clean air apart from the dirty, which is why your air filters are needed. The air filters in your home clean up incoming airflow, but in the process will become dirtier over time. Once your air filters become dirty, they start turning into a problem that only worsens over time.

The air filters in your home need periodic replacement or the effects of the dirty air filters only grow worse over time. Dirty air filters are not able to let air flow easily pass through, meaning that the air inside your home is unable to cycle out. The old air becomes stagnant and dry, which is makes the home generally uncomfortable and unhealthy to stay in. A new air filter allows air to pass through without a problem and prevents the deterioration of air quality.

Air Filter Use for Apartments

An apartment has fewer options when it comes to airflow, with more limited space making every breath count. The air filters in your heating and cooling system become that much more important to keep clean or the lack of airflow begins to affect your home’s livability. The airflow does not stop at a single room either, it goes into multiple rooms before exiting. Your air filters clean out a room's outgoing airflow in order to make sure that no particles enter the duct system. Cleansed airflow throughout your home’s air flow is especially necessary for home’s with resident smokers or pets.

As the airflow travels through your home it becomes cleaner as it passes by various filters, the filters become dirtier as a result. Dirty air filters block proper air flow and this becomes especially problematic when outgoing airflow stops particles from filtering out of a room. Air cycling ensures that certain airborne particles do not stay in a room for long. When the air flow cannot pass, then the resulting lack of air cycling leaves airborne particles to settle on whatever surface they can. Your home becomes less comfortable and safe when it becomes covered in irritants, making it important to regularly install new air filters.

Furnace Filters

Your furnace air filters are capable of fitting into a variety of different air systems and providing them with protection. HVAC systems and heating air systems alike are able to use furnace filters to keep incoming airflow clean. HVAC systems have filters placed in between where the incoming air heats up and where the blower fan distributes it throughout your home’s ducts. The air filters in the system keep the heated air clean, but when dirty block it off leading to some serious consequences.

When proper air flow in a furnace system becomes blocked off, that means that the internal temperatures are in danger of a steep rise. The furnace may not be able to handle the strain that comes with such extreme temperatures and become damaged in the process. Furnace parts are not cheap to replace, and the costs only rise as the temperatures become worse. It is simpler and more financially responsible just to buy new air filters for the furnace, air conditioner, or HVAC system.

Air Filter Changing Practices

Your air filters need periodic changing to prevent any of the issues that come with having blocked air filters in a system. Dirty air filters affect more than just the air inside your home, they also affect your billing. The air systems will try and push airflow past the blockage which will cause an increase in your home’s energy billing. The rise in electrical usage also wears on your air system's mechanical parts, eventually leading to costly repairs.

You are able to accurately gauge when a new air filter is needed by taking the environment and MERV (Minimum Efficiency Reporting Value) rating into account. Your home may have any number of irritants fill the air around it and in turn, make the air filters in an HVAC system work harder to keep incoming air clean. Your air filter’s MERV rating helps you see just how efficient it is at stopping incoming particles from the air passing through it. Filter King offers premium quality air filters unlike other standard filters, and rank as an eight on the MERV scale and are able to block out irritants like:

  • Pollen
  • Household Dust
  • Mold spores
  • Dust Mites
  • Bacteria
  • Pet Dander
  • Smoke
  • Particles that carry viruses
  • Tobacco Smoke
  • Large Particles

Replacing an Old Filter

Old filters will eventually require replacement, the process does not take very long and only requires a few steps. First, you will need to find out what size the new air filters are going to need to be. You will be able to find the correct size by reading it off of the old filters cardboard edge. Afterward, you will be able to order new correctly sized filters and enjoy the incoming fresh airflow.

Air Filter Delivery

Filter King premium 18x24x1 air filters are available for order today at affordable prices with even better discounts. Shipping for orders of two or filters is free, and the filters are usable for any appropriate HVAC system upon arrival. You may even have your filters delivered at a regular rate with our air filter subscription service, filters are brought to your home as often as monthly. Order today and enjoy clean filters bringing in fresh airflow to your household. You can also signup for a filter change reminder program here and never forget about replacing your air filters.