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13x21.5x1 Air Filter Merv 8
13x21.5x1 AC Filter Merv 11
13x21.5x1 Furnace Filter Merv 13
13x21.5x1 Filter Merv 13 Titanium
13x21.5x1 Filter Merv 10 Carbon
13x21.5x1 Filter Merv 8 Carbon 13x21.5x1 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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13x21.5x1 Air Filter

AC Furnace Air Filter 13x21.5x1 -Inches

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Odor Eliminator

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Product Description

Item Model Number: FKFB13X21.5A
Brand: Filter King
Filter size: 13x21.5x1
Actual Size: 13 x 21.5 x .75
1-Inch Filter
MERV 8 Filter Rating
Protection From: Pollen, Household Dust, Mold Spores, Dust Mite Debris, Bacteria, Pet Dander, Smoke, Viruses
Residential / Commercial Use

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 13x21.5x1 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.

13x21.5x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 13x21.5x1 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.

Filter King 13x21.5x1 Air Filter: About the Product

Our very own branded 13x21.5x1 Air Filter is an efficient tool for cleaning up the airflow in and around your home. Protect your family today. Find out more. 

Filter King 13x21.5x1 Air Filter: Overview

Filter King’s 13x21.5x1 is a replacement media filter that works to clean, cool, and condition the air in your home or business. Any AC or furnace needs the right filter to ensure your home’s air quality is free from irritants and airborne pollutants.  

Here at Filter King, we know firsthand how busy home life can get, but regularly replacing your air filter should never be sidelined. That’s why you can purchase the 13x21.5x1 Furnace Filter as part of our cost-effective monthly subscription service. 

To prevent any blockage from a dirty filter, it’s vital you continue replacing your air filters for clean and unpolluted air quality in your home. Our 13x21.5x1 AC Filter has been specially designed to protect you against any airborne contaminants, including pet dander, dust, pollen, smoke, bacteria, and lots more.

Best of all, our 13x21.5x1 air filters come in a range of MERV ratings. For the safest air filtration, always choose maximum protection. 

Filter King 16.5x21x1 Air Filter: Specifications

A Durable Filter

Filter King’s very own air filters are designed and manufactured to be durable and long-lasting. The lifespan of the 13x21.5x1 air filter is approximately 3 - 6 months, but remember that this durability will depend on the air quality inside your home too. Always be fully prepared by relying on our subscription service that delivers your replacements on time, every time.

A Compatible Filter

This filter is compatible with any Carrier Filter System.

A Versatile Filter

Rest assured the Filter King 16.5x21x1 Air Filters are suitable for both residential and commercial use. Filter King has you covered, no matter whether you’re a home-owner, business-owner, or pet-owner. 

Why Choose Filter King?

1. We Remember for You

You can sit back, relax, and never forget to change your filter. Order with our monthly subscription service today.

2. We Offer Unbeatable Prices

We reward your loyalty with unbeatable prices. The more you buy, the less you pay. 

3. Made in the U.S.A.

All of our filters are proudly manufactured and assembled in the U.S.A. Share our pride by ordering with us.