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12x18x0.5 Air Filter Merv 8 12x18x0.5 Air Filter Merv 8
12x18x0.5 AC Filter Merv 11 12x18x0.5 AC Filter Merv 11
12x18x0.5 Furnace Filter Merv 13 12x18x0.5 Furnace Filter Merv 13
12x18x0.5 Filter Merv 13 Titanium 12x18x0.5 Filter Merv 13 Titanium
12x18x0.5 Filter Merv 10 Carbon 12x18x0.5 Filter Merv 10 Carbon
12x18x0.5 Filter Merv 8 Carbon 12x18x0.5 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

12x18x0.5 Air Filters

(Actual Size: 11.5 x 17.5 x 0.5)

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 12x18x0.5 Air Filters

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Product Description

AC Furnace Air Filter 12x18x0.5 -Inches

Item Model Number: FKFB12X18X0.5
Brand: Filter King
Filter Size: 12x18x0.5
Actual Size: 11.5 x 17.5 x 0.5
1/2-Inch Filter
MERV 8 Filter Rating
Protection From: Pollen, Dust, Mold, Dust Mites, Bacteria, Pet Dander
Residential / Commercial Use

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 12x18x0.5 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.

12x18x0.5 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 12x18x0.5 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.