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19x21x1 Air Filter Merv 8
19x21x1 AC Filter Merv 11
19x21x1 Furnace Filter Merv 13
19x21x1 Filter Merv 13 Titanium
19x21x1 Filter Merv 10 Carbon
19x21x1 Filter Merv 8 Carbon 19x21x1 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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19x21x1 Air Filter

AC Furnace Air Filter 19x21x1 -Inches

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Odor Eliminator

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Product Description

Item Model Number: FKFB19X21
Brand: Filter King
Filter size: 19x21x1
Actual Size: 18.5 x 20.5 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, 19x21x1 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.

19x21x1 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 19x21x1 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.

19x21x1 Air Filter

Filter King 19x21x1 size air filters are important parts of whatever air system they are installed in. The filters act as cleaners that trap and absorb particles right out of passing airflow to keep it coming in clean. The indoor air quality of your home benefits from having air filters in place to keep the air coming in clean and clear of irritants. However, the filters do not last forever and will eventually require maintenance and replacement. If they are not replaced, the air filters in your home will grow dirtier over time, causing problems for their systems and eventually your home as a whole.

The air filters in your home are best kept clean and clear so that airflow passes through without any issues. When airflow becomes blocked then your home has a problem when there is no way to cycle out the old air stagnating and drying out inside. The airflow becomes hindered or blocked, which also means that the systems become strained trying to push it through the blockage. The systems resulting increased use of electricity over time leads to possible mechanical damage to your systems and a rise in energy billing.

It is better to have new filters installed before the effects of dirty air filters become more apparent over time. Filter King has fresh, new 19x21x1 size air filters available for purchase. The filters are ready-for-use upon arrival, and we ship orders of two or more out for free. We also offer a subscription option where your orders ship out periodically. The filters themselves rate as an eight on the MERV (Minimum Efficiency Reporting Value) scale. The number indicates their ability to block out irritants like:

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

19x21x1 Furnace Filters

Filter King air filters are available for use in multiple air systems including the average home’s furnaces. Furnace filters fit into your home’s system and keep the air pumped in from polluting your home. The filters become dirty like any other though, and will inevitably require replacement. Dirty furnace filters present a serious risk as they block off airflow that has been heated. The resulting rise in temperatures may cause serious mechanical damage and lead to costly repairs.