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17x21x1 Air Filter Merv 8
17x21x1 AC Filter Merv 11
17x21x1 Furnace Filter Merv 13
17x21x1 Filter Merv 13 Titanium
17x21x1 Filter Merv 10 Carbon
17x21x1 Filter Merv 8 Carbon 17x21x1 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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17x21x1 Air Filter

AC Furnace Air Filter 17x21x1 -Inches

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Product Description

Item Model Number: FKFB17X21A
Brand: Filter King
Filter size: 17x21x1
Actual Size: 17 x 21 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, 17x21x1 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.

17x21x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 17x21x1 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.

17x21x1 Air Filter

Filter King 17x21x1 size air filters are valuable tools used by your air systems to keep incoming airflow clean and clear of harmful particles. Our air filters are ergonomically designed to keep air coming into your home naturally while preventing entry to a range of allergens and pollutants. Your home’s indoor air quality depends on filtration, and how effectively cleaned the air is as your systems bring it into your home. Air filters are the tools systems use to clean up airflow, but they become dirtier over time.

The air filters in your home become dirty as they continue to draw in and absorb harmful irritants over time. When the filters become too dirty, they become a blockage in your air systems that hinder and may even block out airflow. Problems with airflow become problems for your home as a whole when the air inside begins to dry out and stagnate. Your air systems become strained as dirty air filters cause them to use additional energy as they try to push past the blockage.

A strained air system is in danger of mechanical failure and leads to additional costs over time as the problem worsens. New air filters will help keep your incoming air from being hindered or blocked, and keep it clean as well. Our air filters rank as an eight on the MERV (Minimum Efficiency Reporting Value) scale. The scale is used to help you see how efficient an air filter is, and our filters are capable of blocking out irritants like:

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

17x21x1 Furnace Filters

Our filters are versatile and efficient, they are able to fit into a variety of air systems including furnaces. The furnace filters for your system keep incoming airflow clean, but they also become dirty as well when left for long enough. Dirty furnace filters come with their own problems, they prevent airflow from passing through which is made worse by the fact that the air is heated. The resulting temperature fluctuations throughout your home and the rise in temperature for your furnace may cause severe issues for your home. Order new air filters and avoid unnecessary air problems as the airflow comes in naturally and fresh.