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20x25x5 Air Filter Merv 8 20x25x5 Air Filter Merv 8
20x25x5 AC Filter Merv 11 20x25x5 AC Filter Merv 11
20x25x5 Furnace Filter Merv 13 20x25x5 Furnace Filter Merv 13
20x25x5 Filter Merv 13 Titanium 20x25x5 Filter Merv 13 Titanium
20x25x5 Filter Merv 10 Carbon 20x25x5 Filter Merv 10 Carbon
20x25x5 Filter Merv 8 Carbon 20x25x5 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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Lennox 20x25x5 Air Filters

Replacement Filter for Model X6673

Actual Size: 19.88 X 24.88 X 4.38

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Product Description

Item Model Number: FKDPFW20X25X5=DLX
20x25x5 (19.88 x 24.88 x 4.38) MERV 8 Filter King Replacement Filter for Lennox X6673

Manufactured in the US

Why Buy Air Filters From Filter King?


In comparison to fiberglass filters, 20x25x5 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.

20x25x5 Air Filter Reviews

What MERV Rating should I choose?

How Often to Change Your 20x25x5 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.

Lennox X6673 20x25x5 Air Filter: About the Product

The Lennox 20x25x5 air filter is a reliable and long-lasting filter that cleans the airflow in and around your home. Protect your home today. Find out more. 

Lennox 20x25x5 Air Filter: Overview

The Lennox 20x25x5 air filter is a replacement media filter for your X6673 Furnace that cleans, cools, and conditions the air in your home. Remember that the performance of your AC or furnace relies on the regular replacement of the air filter inside, so choose Lennox air replacement filters to keep your home free from airborne contaminants.

We know that home life can be endlessly busy, but replacing the air filters in your AC or furnace should never be forgotten about. That’s why using our cost-effective subscription service is the perfect way to purchase your Lennox 20x25x5 whole house filter.

The specially-designed Lennox 20x25x5 air filter will protect you and your family from airborne pollutants and contaminants including but not limited to dust, pollen, pet dander, smoke, bacteria, and other nasties. Regularly replacing your air filters will prevent blockages clogging up your AC or furnace too. 

The Lennox 20x25x5 air filters are available in a variety of MERV ratings. For the safest air filtration, always choose maximum protection.

Lennox 20x25x5 Air Filter: Specifications

A Durable Filter

Lennox air filters are designed and manufactured to be durable and long-lasting. Always be fully prepared by relying on our subscription service to deliver your replacements on time, every time.

A Compatible Filter

This filter is compatible with the Lennox X6673 Filter or X6673 Furnace.

A Versatile Filter

Rest assured the Lennox 16x25x5 is 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.