WE ARE OPEN! All filters are made in the USA in our Alabama warehouse.

20x21x1 Air Filter

AC Furnace Air Filter 20x21x1-Inches

1. Select Filter Quality

Odor Eliminator

2. Select Quantity

${{ money(priceWithoutDiscount()) }} Save ${{ money(savePrice()) }} ({{ savePercent()}}%)

Out of stock

Product Description

Brand: Filter King
Filter size: 20x21x1
Actual Size: 20 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

20x21x1 Air Filter

Filter King 20x21x1 size air filters are used by your air systems to protect your home by cleaning out incoming airflow. Your air systems will constantly bring air inside, but there is no way for them to be able to tell the clean air from the dirty. Air filters are installed so that all the air passing through has any traveling particles captured and absorbed in the tight mesh weaving. The process is necessary to keeping your home’s indoor air quality up, but the air filters become dirty in the process. Dirty air filters are covered in particles and present a clear problem for your home.

The air filters in your home are necessary tools, but they become an issue when they become dirty. Dirty air filters become covered in the particles they have absorbed or captured, which makes it hard for air to pass through. When airflow has a problem making it into your home, the air inside is unable to cycle out leading to dryness and stagnation. Your air systems become strained as they try to push airflow through the blockage, resulting in mechanical damage and a rise in energy billing over time.

The air filters in your home require regular maintenance to keep airflow coming in fresh and clean. We offer 20x21x1 size air filters at affordable prices that are usable upon arrival at your home. We also have a subscription option to have your orders delivered as often as monthly, orders of two or more filters are shipped out for free. Our filters have a MERV (Minimum Efficiency Reporting Value) rating of eight, and block particles like:

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

20x21x1 Furnace Filters

The furnace filters in the system work like they do in any other home air system, cleaning airflow and keeping it clean before it enters your home. The filters will continue to clean out the heated airflow over time, but they become more and more dirty over time. Dirty furnace air filters block heated airflow, which leads to problems with temperatures over time. The furnace may become damaged and the air inside your home may face temperature fluctuations. Purchase new filters today to help keep airflow coming in without issue.