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Lennox Furnace Filter Size : Find Your Home Air Filter in 2024

Lennox Elite Furnace Filter Sizes

Find Your Lennox Filter Easily using the simple furnace filter size finder. Simply enter the Filter Part Number or Size from Your Current Filter in the Search, for example, enter X8795 or 16x25x5. Lennox has its part numbers on the size for the filter. You can also find your Lennox Furnace listed by size and model number on this page.

Buy Lennox Furnace Filters 

What size filter does my Lennox furnace take? You can find the Lennox part number or the Lennox furnace filter size on the side of the Lennox furnace filter. Filters are measured by Nominal size which is a rounded number that varies by brand so many filters have the part number for each brand they are compatible with listed. The Lennox filter below shows it Part number X0583 and the Honeywell part numbers, FC100A1029 and FC35A1001, that this filter can replace. 

Furnace Filter Part number

Lennox Furnace Filters Size

Using the list below you can find the Lennox MERV 16 filter and the Lennox filters kit for your Lennox Furnace filter size. We also have the Lennox MERV 11 filters by size and model number so you can find your Lennox Filters easily.

Lennox MERV 16 Air Filters and Atomic Equivalent Compatibles

See MERV 16 Air Filters by Lennox and Maintenance Kits. Click your model to see full details or add to cart below. Save Big with the Atomic Compatibles which are designed to meet or exceed the performance of the OEM.

  • X6672 - Nominal size 16" x 25" x 5" ( Actual size 15 7/8" x 24 7/8" x 4 3/8" )
  • X6672 - Equivalent by Atomic 16x25x5 MERV 16 Filter
  • X6675 - Nominal size  20" x 25" x 5" ( Actual size 19 7/8" x 24 7/8" x 4 3/8" )
  • X6675 - Equivalent by Atomic 20x25x5 MERV 16 Filter
  • X6666 - Nominal size 17"x26"x4" (Actual size 16 5/8" x 26 " x 4")
  • X6666 - Equivalent by Atomic 17x26x4 MERV 16 Furnace Filter
  • X6669Nominal size 21"x26"x4" ( Actual size 20-3/4" x 25-3/4" x 3-3/4" )
  • X6669 - Equivalent by Atomic 21x26x4 MERV 16 Filter fits PCO-20C
  • X7935Nominal size 20"x20"x5" ( Actual size 19-3/4" x 19-7/8" x 4-3/8" )
  • X7935 - Equivalent by Atomic 20x20x5 MERV 16 Filter fits HCF14-16 
  • X8788Nominal size 20" x 26" x 5" ( Actual Size: 20" x 25-1/2" x 4 3/8" )
  • X8788 - Equivalent by Atomic
  • X8789Nominal size 17" x 26" x 5" ( Actual 16.31" x 25.47" x 4.31" )
  • X8789 - Equivalent by Atomic
  • X8790Nominal size 20" x 26" x 5" ( Actual Size 20" x 25 1/2" x 4-3/8" )
  • X8790 - Equivalent by Atomic


PCO Cartridge

  • Y6607 - Lennox Y6607 PC03-20-16 Air Purification Cartridge for PC03-20 and PC03-16 Model/Part Number: 613860-01 20 x 26 x 5
MERV 16 Kits
  • X8795includes: (1) MERV 16 pleated filter model X8788 (1) PCO metal insert model X8791 (2) UV lamps model X8794
  • X8796includes: (1) MERV 16 Filter X8789 (1) PCO metal insert X8792 catalyst (2) X8794 UV lamps
  • X8797 - (1) MERV 16 pleated filter model X8790 (1) PCO metal insert model X8793 (2) UV Lamps Model X8794
  • X8347 - (1) MERV 16 pleated filter model X6666 (1) Catalyst Insert - Model 75X73 (new 1" design) (4) UV Lamps Model X8149 (Formerly 10M35)
  • Y6608 - (1)20" x 26 "x 5" filter - Y6604 (1) catalyst - Y6607 UV lamps - X8794
  • Y6612 - (1) MERV 16 Carbon Filter Y6605 16x26x5 (1) PUREAIR CARTRIDGE Y6607 (1) UVA LAMP (X8794)
  • Y6616 -  (1) Y6606: Healthy Climate Carbon Clean 16 Filter (1) Y6621: PCO cartridge (1) X8794 UVA lamp

 Popular Lennox Furnace Filters by Model Number With Size

X8309 (HCXF20-10) Expandable Replacement Filter - 16x25x5 (Actual Size of Assembled Frame - 15-3/4" X 24-3/4" X 4-7/16") 

X8310 MERV 10 Expandable - Nominal Size: 20" x 25" x 5" (Actual Size: 19 3/4" X 24 3/4" X 4 7/16")

X6670  Nominal Size: 16" x 25" x 5"( Actual Size: 15-3/4" X 24-3/4" X 4-3/8" )

X6673  Nominal Size: 20x25x5 MERV 11 Filter- ( Actual Size 19-3/4" X 24-3/4" X 4-3/8" ) for HCF20-16

X6675  Nominal size: 20" x 25" x 5" - ( Actual size: 19 7/8" x 24 7/8" x 4 3/8" )

X0584 BMAC-14CE MERV 11 Filter - 16" x 26" x 5" OEM ( Actual Size 16 3/8 x 26 x 5 5/32)

X0586 Nominal size: 20" x 25" x 5" - ( Actual size: 20" x 24.75" x 4.375") 

X0587 Nominal size: 20" X 26" X 5" - ( Actual Size 20 7/16" x 26" x 5 5/32" )

X6667 Nominal size: 21" x 26" x 4"  ( Actual Size 20 3/4" X 25 3/4" X 3 3/4" )

X6664 Nominal size: 17" x 26" x 4" - ( Actual size 16-1/2" x 25-7/8" x 3-15/16" )

X0444 Nominal size: 28" x 17" x 6" 

X0445 Nominal Size: 25" x 20" x 6"  

X5422 Nominal Size: 20" x 26" x 3" 

See entire list at the end of this Article  

See the complete listof 1 inch, 2 inch and 4 Inch Filters by Size and MERV rating.

Lennox Air filters are critical components of your heating and cooling system. Your air filter helps improve the quality of your home’s air and keep your system performing at optimal efficiency saving on power consumption. The most common filters are standard disposable cartridges, but advanced filtration systems and air cleaners are also available from Lennox. Atomic carries a vast selection on original Lennox products and compatible furnace filters for your HVAC system.

Comparing Lennox Furnace Filters to other Brands: Find Your Filter By Brand

Atomic Filters carries Top Brands Like Lennox Furnace Filters and Carrier EZ Flex Filters at the Best Prices with Free Shipping. Looking for Lennox Healthy Climate Filters or Lennox X6673 Air filters? You will find a wide selection available. Lennox makes superior quality air filters. Atomic Filters stocks an extensive selection of the Lennox brand air filters including the popular X6675 air filters. The X6673 Furnace Filters also known as the Lennox X6673 Air Cleaner Filter Media for HCC20-28 - 20x25x5 is compatible with a wide variety of systems including Honeywell, Trion Airbear and Carrier. It is however important when looking for a compatible filter to make sure it is compatible with the exact model.

How to Find the Right Lennox Air Filter for You Using the MERV Rating System

Shop Lennox Air Filters 

Where are the filters on a Lennox furnace?

Lennox furnace filters will be in one several possible locations, in the blower compartment of your furnace, a filter cabinet or a return grill in the wall.

Where is my Lennox air filter located Where is Lennox Pure Air filter located 

Home Air Filters: What You Need to Know About Air Filter Simplified

We are going give you a simple way to pick the right air filter for your home because choosing  the best air conditioner filter for your allergies can sometime be a confusing task. The simple reason is that most people are not experts on their  heating and air conditioning systems and generally rely on the recommendation of the company that services their HVAC (Heating Ventilation Air Conditioning) equipment.

What contaminants are in the air in my home

What Type of Air Filter do I Currently have In My Home?

The MERV (Minimum Efficiency Reporting Value)  rating system was designed to help tell how well an air filter removes particles from the air. What is MERV rating of the filter in your home? You may not even know because, more often than not, the company that services your HVAC system replaces the air filters during the service call. Each air return has a  grill that open so that you can replace your air filter. Depending on the size of your home you may have one air return to several. When replacing filters I see a lot of contractors use a cheap flat panel air filters with no MERV rating or a very low MERV rating.  I have asked contractor many times when they put that filter in over  the years and the answer is always the same. "This is the kind of air filter and I use is my self, those expensive air filters are a waste of money". Most people do not know much about how their HVAC system works so they just rely on what their contractor says. Basically all these cheap air filters do is  protect your HVAC equipment from large dust and lint. Essentially the cheap air filters with no MERV ratings can be so porous that particles that can damage your HVAC equipment, can pass right through the filter. Good air filters can protect the air quality in your home and do not have to be expensive. See a complete list of Air filter sizes by MERV rating on the furnace filter size chart.

Lennox Home Air Filters MERV ratings simplified

Lennox Merv 16 Filter

The Lennox X6675 Air Filter represents the finest quality filter on the market, with the most extreme and efficient particle filtration available just below that of a complete HEPA system. Lennox Industries is currently one of the few manufacturer to offer a MERV 16 filter, the X6672 Lennox Healthy Climate 16x25x5 Merv 16Filter and the X6675 in the 20″ x 25″ x 5″  are some of the most popular sizes.  Atomic stock the most popular annual maintenance kits such as the X8796, X8795 and the X8797 and offer dscount pricing with free shipping.

For Allergy suffers Healthy Climate Carbon Clean 16 Media Air Cleaner

To protect those in your family who suffers from allergies or other respiratory irritants, this filter is very best filter at eliminating irritating particles from the indoor air, and will help keep you and your family allergen free and healthy.

How often do you change the filter on a Lennox furnace? Lennox furnaces can be configured with a 1 inch filter or a filter cabinet. If the furnace has a 1 inch filter you will generally replace it every 30 to 90 days where a 4 to 6 inch cabinet filter may last from 6 months to 1 year.

How long before you need to change a filter can depend on factors such as the quality of filter and the environmental factors in your home or where you live. For instance, a home in a dusty dessert environment or a home undergoing renovation, smoke in the home or environment, or Pets in the home can require more frequent filter changes. 

What MERV does Lennox recommend? According to Lennox's HVAC buying guide, they recommend a filter with a minimum efficiency of MERV 10 or higher.

How to get the right Lennox PureAir System Annual Maintenance Kit. Compare you current MERV 16 model number to the Lennox Kits. For example the X8795 Kit uses the X8788 MERV 16 Filter. 

  • X8795 includes: (1) MERV 16 pleated filter model X8788 (1) PCO metal insert model X8791 (2) UV lamps model X8794
  • X8796 includes: (1) MERV 16 Filter X8789 (1) PCO metal insert X8792 catalyst (2) X8794 UV lamps
  • X8797 - (1) MERV 16 pleated filter model X8790 (1) PCO metal insert model X8793 (2) UV Lamps Model X8794

Lennox X8795 Kit X8788 Filter X8791 PCO X8794 Bulbs 2

Can you use any filter in a Lennox furnace? You do not necessarily need to use a Lennox filters,  but you should choose a filter that is made to be compatible with the size and model number of a specific filter you are replacing. Atomic Filters makes filters that are made to have a low resistance and have the proper sizing and features needed for use in Lennox systems.

Do Lennox furnaces have filter? Yes your Lennox furnace will have an air filter.

Where is the Lennox ml193uh filter location? You furnace filter will be located on the side of the unit or at the bottom of the unit, unless it has a filter cabinet. Note Unit can be installed in upflow, downflow or horizontal
unit applications.

Where is Lennox furnace filter located? You furnace filter will be located in the blower compartment or a filter cabinet or in a return grill on a wall.

Shop Lennox Furnace Filters

Using a high quality filter, will help ensure that your system  is protected and operated at peak performance, efficiency and effectiveness for your heating and cooling unit. When it come to saving money on your Lennox furnace filter it makes sense to buy your Lennox furnace filters online.

Carbon Clean 16 Model hcf20-16 Discounts

X6675 Lennox 20x25x5 MERV 16 Filter Media for HCC20-28 sold by Atomic Filters

The OEM Lennox Healthy Climate MERV 16 Media Air Cleaner is a High-efficiency media filter is available new at Atomic Filters for a Discounted price with free Shipping. When you buy the is filter you get a high Merv(MERV 16/CADR 1900) and Up to 95% efficiency in removing circulated dust and other particles from 3 microns and up to 95% efficient in removing mold spores and other bioaerosols from 3 microns.

Changing Your Lennox Filters: Note the size printed on the filter frame

Need to know how to change air filter on Lennox furnace? When you removed an old filter, check its size so you can be sure you have the correct filter for replacement. Lennox air filter location can be in the furnace blower compartment, in a filter cabinet as pictured or in filter return vents in the home. If you have any questions about the size you need, you can refer to the owner’s manual for your furnace or air handler.

Find Your Lennox Filter by Size or Model Number

5 Responses

Mike Hall

Mike Hall

December 03, 2023

I have a lennox furnace Model # EL195UH090XE48C-04
Serial # 5914D32503
What is the correct lennox filter # And size
Thank You

Rodger Ellis

Rodger Ellis

April 07, 2023

I have a 2001 LENNOX G 20 furnace with fan speed on high. The existing air filter is the 16×25×1″ foam looking original that doesn’t filter much. Can I replace this filter with a MERV 8 and not harm the fan motor or restrict air flow too much? Thanks

joe walsh

joe walsh

February 28, 2023

need correct filter sized for my elo183 oil furnace. thanks joe

joe walsh

joe walsh

February 28, 2023

Could you give me the correct filter sized for my elo183 lennox oil furnace. please

Sue Weaver

Sue Weaver

February 28, 2023

We have a model CX34-43C-6F-1 home furnace. We have a 20×25x 5 filter in it now, but it looks about an inch too short. Can you please advise as to which size filter this model should use? I want to make sure we are using the correct size. Thank you.

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