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20 Best Filter For Lennox Furnace (2023 Updated)

In general, a filter for a Lennox furnace is typically located within the unit itself, and is responsible for trapping dust, dirt, and other airborne particles before they can enter the furnace and potentially clog or damage it.

It is important to regularly check and clean your furnace filter to ensure that it is functioning properly and to prevent any potential problems.

20 Best Filter For Lennox Furnace

Product Image Product Name Features Price

Lennox X8310 MERV 10 Expandable Filter 20 x 25 x 5

  • 10 / 20″ X 25″ X 5″

Tier1 Lennox 16x20x5 MERV 11 Replacement AC Furnace Air Filter (2 Pack)

  • 16x20x5

Lennox X0582 – BMAC 16" x 20" x 5" Furnace Filter

  • 16 inch X 20 inch X 5 inch / 11, Size: 16x20x5

Lennox X6667 – Filter 21x26x4 MERV 10

  • REPLACEMENT FILTER: Replacement air filter for your Lennox Healthy Climate air purifiers; for best results, replace the filter every 6 months

Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter (2 Pack), Size: 20x20x5

  • 50% First-pass reduction of ozone.
  • Hospital inpatient / general surgery level filtration.
  • Removes over 95% of (sub-micron) particles down to 0.3 microns.

Lennox Healthy Climate Filter X6675 – 20" x 25" x 5" MERV 16 Carbon Clean

  • MERV 16 Rated
  • Orginal Factory OEM Replacement Filter
  • Replaces Honeywell FC35A1027, FC100A1037, FC200E1037

Lennox X6673 Filter,20 x 25 x 5,MERV 11"

  • Replacement for HCXF20-10, HCF20-10
  • X6673 Replacement Filter for Lennox and Honeywell
  • Replacement for FC35A1027, FC100A1037, FC200E1037, F35Expandapac

Lennox X6673 20x25x5 MERV 11 Furnace Filter – 2 Pack

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch

Filterbuy 17x26x4 MERV 11 Pleated HVAC AC Furnace Air Filters for Lennox (1-Pack), Gold

  • 11 / 17x26x4 (16.5x26x4.13)

X6675 Lennox 20x25x5 MERV 16 Filter Media for HCC20-28

  • Make sure this fits by entering your model number.
  • Imported.

Filter, 20 x 25 x 5, MERV 11: Fits Lennox Brand, Universal

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch

Lennox 28 inch x 17 inch x 6 inch MERV 10 Media Filter

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch

Nordic Pure 20x25x5 MERV 12 Pleated Lennox X6673_X6675 Replacement AC Furnace Air Filters 2 Pack

  • Nominal Size: 20 x 25 x 5 L x RED, Actual Size: 19 3/4 x 24 3/4 x 4 3/8 (19.75 x 24.75 x 4.38).
  • Attracts indoor allergens, dust, pollen and other airborne contaminants.

Lennox X6672 MERV 16 16x25x5 Genuine Air Filter (2-Pack)

  • Lennox X6672 Air Filter includes carbon coated fiber matrix
  • Replace at least once every six to nine months for optimum performance

X6673 Lennox 20"x25"x5" MERV11 Repl Filter

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch

Lennox Corporation X8309 MERV 10 16x25x5 Filter

  • 16x25x5 (Actual Size of Assembled Frame
  • you can purchase a new kit
  • NOTE: Plastic frame gets re-used. When changing filter

Lennox X0582 – 16" x 20" x 5" MERV 10 Pleated Air Filter

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch

Bestair LN2025-13C Furnace Filter, 20" x 25" x 5", Lennox Odor Eliminating Replacement, MERV 13

  • Designed to perform with high efficiency and minimum pressure drop; conserving energy and lowering costs
  • Minimum Efficiency Reporting Value (MERV) of 13; generating the best filtration with fewer particles and contaminants that pass through the filter
Lennox X8310 MERV 10 Expandable Filter 20 x 25 x 5
  • 10 / 20″ X 25″ X 5″
Tier1 Lennox 16x20x5 MERV 11 Replacement AC Furnace Air Filter (2 Pack)
  • 16x20x5
Lennox X0582 – BMAC 16" x 20" x 5" Furnace Filter
  • 16 inch X 20 inch X 5 inch / 11, Size: 16x20x5
Lennox X6667 – Filter 21x26x4 MERV 10
  • REPLACEMENT FILTER: Replacement air filter for your Lennox Healthy Climate air purifiers; for best results, replace the filter every 6 months
Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter (2 Pack), Size: 20x20x5
  • 50% First-pass reduction of ozone.
  • Hospital inpatient / general surgery level filtration.
  • Removes over 95% of (sub-micron) particles down to 0.3 microns.
Lennox Healthy Climate Filter X6675 – 20" x 25" x 5" MERV 16 Carbon Clean
  • MERV 16 Rated
  • Orginal Factory OEM Replacement Filter
  • Replaces Honeywell FC35A1027, FC100A1037, FC200E1037
Lennox X6673 Filter,20 x 25 x 5,MERV 11"
  • Replacement for HCXF20-10, HCF20-10
  • X6673 Replacement Filter for Lennox and Honeywell
  • Replacement for FC35A1027, FC100A1037, FC200E1037, F35Expandapac
Lennox X6673 20x25x5 MERV 11 Furnace Filter – 2 Pack
  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
Filterbuy 17x26x4 MERV 11 Pleated HVAC AC Furnace Air Filters for Lennox (1-Pack), Gold
  • 11 / 17x26x4 (16.5x26x4.13)
X6675 Lennox 20x25x5 MERV 16 Filter Media for HCC20-28
  • Make sure this fits by entering your model number.
  • Imported.
Filter, 20 x 25 x 5, MERV 11: Fits Lennox Brand, Universal
  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
Lennox 28 inch x 17 inch x 6 inch MERV 10 Media Filter
  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
Nordic Pure 20x25x5 MERV 12 Pleated Lennox X6673_X6675 Replacement AC Furnace Air Filters 2 Pack
  • Nominal Size: 20 x 25 x 5 L x RED, Actual Size: 19 3/4 x 24 3/4 x 4 3/8 (19.75 x 24.75 x 4.38).
  • Attracts indoor allergens, dust, pollen and other airborne contaminants.
Lennox X6672 MERV 16 16x25x5 Genuine Air Filter (2-Pack)
  • Lennox X6672 Air Filter includes carbon coated fiber matrix
  • Replace at least once every six to nine months for optimum performance
X6673 Lennox 20"x25"x5" MERV11 Repl Filter
  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
Lennox Corporation X8309 MERV 10 16x25x5 Filter
  • 16x25x5 (Actual Size of Assembled Frame
  • you can purchase a new kit
  • NOTE: Plastic frame gets re-used. When changing filter
Lennox X0582 – 16" x 20" x 5" MERV 10 Pleated Air Filter
  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
Bestair LN2025-13C Furnace Filter, 20" x 25" x 5", Lennox Odor Eliminating Replacement, MERV 13
  • Designed to perform with high efficiency and minimum pressure drop; conserving energy and lowering costs
  • Minimum Efficiency Reporting Value (MERV) of 13; generating the best filtration with fewer particles and contaminants that pass through the filter

1. Lennox X8310 MERV 10 Expandable Filter 20 x 25 x 5

Lennox X8310 MERV 10 Expandable Filter 20 x 25 x 5

  • 10 / 20″ X 25″ X 5″

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Sold By Price
Amazon.com – Seller
eBay – voomisupply
Walmart – Filters Fast LLC
Voomi Supply

Product Details

Specifications

Details
Product Dimensions 19 x 5 x 4.25 inches
Is Discontinued By Manufacturer No
Item Package Quantity 1
Minimum Efficiency Reporting Values (MERV) 11

Reviews From Real Customers

Claudette Hudson
S.S.
N.F.

2. Tier1 Lennox 16x20x5 MERV 11 Replacement AC Furnace Air Filter (2 Pack)

Tier1 Lennox 16x20x5 MERV 11 Replacement AC Furnace Air Filter (2 Pack)

  • 16x20x5

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Amazon
eBay – discountfilterstore
Walmart – DiscountFilterStore
DiscountFilterStore.com

Product Details

Specifications

Details
Assembled Product Weight 5 lb
Assembled Product Dimensions (L x W x H) 19.75 x 4.38 x 15.88 Inches

Reviews From Real Customers

1945gs
Justin H.

3. Lennox X0582 – BMAC 16″ x 20″ x 5″ Furnace Filter

Lennox X0582 - BMAC 16

  • 16 inch X 20 inch X 5 inch / 11, Size: 16x20x5

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Sold By Price
Amazon
Walmart – SameDaySupply.com
DiscountFurnaceFilter.com

Product Details

Specifications

Details
Dimensions (Inches) 16 x 20
MERV Rating MERV 10
OEM Yes

Reviews From Real Customers

Carron
I.R.
R.W.

4. Lennox X6667 – Filter 21x26x4 MERV 10

Lennox X6667 - Filter 21x26x4 MERV 10

  • REPLACEMENT FILTER: Replacement air filter for your Lennox Healthy Climate air purifiers; for best results, replace the filter every 6 months
  • KEEPS AIR CLEAN: Filters out and captures dust, pollen, pet dander, and other particles as small as 0.3 microns
  • REPELS ODOR: Removes odors with the coconut-activated and carbon-coated fiber matrix
  • MERV 10 EFFICIENCY: Rated at MERV 10 efficiency for optimal air quality and ability to trap air particles
  • ACTUAL SIZE: Measures 20-3/4 inches long, 25-3/4 inches wide, and 3-3/4 inches high

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Sold By Price
Amazon
Walmart – Filters Fast LLC
Sears – ErgodE
Voomi Supply

Product Details

Specifications

Details
Nominal Size 21″ x 26″ x 4″

Reviews From Real Customers

wanel857

5. Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter (2 Pack), Size: 20x20x5

Lennox X7935 Carbon Clean Healthy Climate MERV 16 Filter (2 Pack), Size: 20x20x5

  • 50% First-pass reduction of ozone.
  • Hospital inpatient / general surgery level filtration.
  • Removes over 95% of (sub-micron) particles down to 0.3 microns.
  • Removes over 90% of ultra-fine particles down to 0.

Check Latest Price

Sold By Price
Amazon
eBay – samedaysupply
Atomic Filters

Product Details

Reviews From Real Customers

nprav
bob.proctor
1alphadog9

6. Lennox Healthy Climate Filter X6675 – 20″ x 25″ x 5″ MERV 16 Carbon Clean

Lennox Healthy Climate Filter X6675 - 20

  • MERV 16 Rated
  • Orginal Factory OEM Replacement Filter
  • Replaces Honeywell FC35A1027, FC100A1037, FC200E1037

Check Latest Price

Sold By Price
Amazon
Walmart – SameDaySupply.com
Wholesale Home
Jackson Systems & Supply

Product Details

Specifications

Details
Dimensions 20″ x 25″
MERV Rating MERV 16

Reviews From Real Customers

M.M.
Einbier
S.T.

7. Lennox X6673 Filter,20 x 25 x 5,MERV 11″

Lennox X6673 Filter,20 x 25 x 5,MERV 11

  • Replacement for HCXF20-10, HCF20-10
  • X6673 Replacement Filter for Lennox and Honeywell
  • Replacement for FC35A1027, FC100A1037, FC200E1037, F35Expandapac

Check Latest Price

Sold By Price
Amazon
eBay
Walmart – Spreetail
DiscountFurnaceFilter.com

Product Details

Specifications

Details
Dimensions 20″ x 25″
MERV Rating MERV 11

8. Lennox X6673 20x25x5 MERV 11 Furnace Filter – 2 Pack

Lennox X6673 20x25x5 MERV 11 Furnace Filter - 2 Pack

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
  • Made in : USA

Check Latest Price

Sold By Price
Amazon
eBay – samedaysupply
Walmart – SameDaySupply.com

Product Details

Specifications

Details
Assembled Product Dimensions (L x W x H) 20.00 x 25.00 x 5.00 Inches

9. Filterbuy 17x26x4 MERV 11 Pleated HVAC AC Furnace Air Filters for Lennox (1-Pack), Gold

Filterbuy 17x26x4 MERV 11 Pleated HVAC AC Furnace Air Filters for Lennox (1-Pack), Gold

  • 11 / 17x26x4 (16.5x26x4.13)

Check Latest Price

Sold By Price
Amazon
Walmart – FilterBuy
FilterBuy

Product Details

Specifications

Details
Assembled Product Weight 3 lb
Assembled Product Dimensions (L x W x H) 16.56 x 25.94 x 4.13 Inches

Reviews From Real Customers

Jasper F.
Rommel D.
Joyce R.

10. X6675 Lennox 20x25x5 MERV 16 Filter Media for HCC20-28

X6675 Lennox 20x25x5 MERV 16 Filter Media for HCC20-28

  • Make sure this fits by entering your model number.
  • Imported.

Check Latest Price

Sold By Price
Amazon
eBay – libbyslibrary
LnBMall.com
AirFilters.com

Product Details

Specifications

Details
Size 1 Count (Pack of 1)

Reviews From Real Customers

*bobbuys*
briguy66mailguy

11. Filter, 20 x 25 x 5, MERV 11: Fits Lennox Brand, Universal

Filter, 20 x 25 x 5, MERV 11: Fits Lennox Brand, Universal

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
  • Made in : USA

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Amazon
The BuildClub

Product Details

Specifications

Details
fits brand Lennox
for use with Universal

12. 20x20x5 (20×19.75×4.38) OEM MERV 16 HCF14-16 Lennox Replacement Filters

20x20x5 (20x19.75x4.38) OEM MERV 16 HCF14-16 Lennox Replacement Filters

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Amazon
eBay – samedaysupply
AirFilters.com
Atomic Filters

Product Details

Specifications

Details
Actual Size 20 X 19.75 X 4.38
Exact Width 19
Exact Width Fraction 3/4″
Exact Length 20
Exact Length Fraction 0″

Reviews From Real Customers

smoke148
boni12char
joncreek

13. Lennox 28 inch x 17 inch x 6 inch MERV 10 Media Filter

Lennox 28 inch x 17 inch x 6 inch MERV 10 Media Filter

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
  • Made in : USA

Check Latest Price

Sold By Price
Amazon
eBay
Walmart
VMInnovations

Product Details

14. Lennox X8789 MERV 16 Filter – 16 inch x 26 inch x 5 inch, Size: 16x26x5

Lennox X8789 MERV 16 Filter - 16 inch x 26 inch x 5 inch, Size: 16x26x5

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Amazon
eBay
Atomic Filters
FiltersFast.com

Product Details

Reviews From Real Customers

m.
Tony S. Conte, Jr.
A.f.

15. Nordic Pure 20x25x5 MERV 12 Pleated Lennox X6673_X6675 Replacement AC Furnace Air Filters 2 Pack

Nordic Pure 20x25x5 MERV 12 Pleated Lennox X6673_X6675 Replacement AC Furnace Air Filters 2 Pack

  • Nominal Size: 20 x 25 x 5 L x RED, Actual Size: 19 3/4 x 24 3/4 x 4 3/8 (19.75 x 24.75 x 4.38).
  • Attracts indoor allergens, dust, pollen and other airborne contaminants.
  • Hypoallergenic and antimicrobial pleated electrostatic filter material.
  • Nordic Pure recommends changing 5″ air filters every 3-6 months.
  • Made in the USA. This item is made to replace the Lennox X6673 and X6675 media air filters.

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Amazon
Bargain Junction

Product Details

Specifications

Details
MERV Rating 12
Product Dimensions 24.75 x 4.38 x 19.75 inches
Style MERV 12
Item Package Quantity 1
Minimum Efficiency Reporting Values (MERV) 12

Reviews From Real Customers

fraktured
yamaha179
ruska7415xi

16. Lennox X6672 MERV 16 16x25x5 Genuine Air Filter (2-Pack)

Lennox X6672 MERV 16 16x25x5 Genuine Air Filter (2-Pack)

  • Lennox X6672 Air Filter includes carbon coated fiber matrix
  • Replace at least once every six to nine months for optimum performance
  • Nominal size: 16 x 25 x 5
  • Actual size: 15 3/4 x 24 3/4 x 4 3/8 inch
  • Made in : USA

Check Latest Price

Sold By Price
Amazon
eBay
Atomic Filters

Product Details

17. X6673 Lennox 20″x25″x5″ MERV11 Repl Filter

X6673 Lennox 20

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
  • Made in : USA

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Amazon
Midwest Appliance Parts

Product Details

18. Lennox Corporation X8309 MERV 10 16x25x5 Filter

Lennox Corporation X8309 MERV 10 16x25x5 Filter

  • 16x25x5 (Actual Size of Assembled Frame
  • you can purchase a new kit
  • NOTE: Plastic frame gets re-used. When changing filter

Check Latest Price

Sold By Price
Amazon
eBay – voomisupply
Walmart – Home Essentials Depot
DiscountFurnaceFilter.com

Product Details

Specifications

Details
Dimensions (Inches) 16 x 25
MERV Rating MERV 10
OEM Yes

Reviews From Real Customers

M.J.W.

19. Lennox X0582 – 16″ x 20″ x 5″ MERV 10 Pleated Air Filter

Lennox X0582 - 16

  • Filter Life: 6-Months
  • Nominal size: 20 x 20 x 5
  • Actual size: 19 3/8 x 19 7/8 x 4 3/8 inch
  • Made in : USA

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Amazon
eBay – samedaysupply
FiltersFast.com
DiscountFilters.com

Product Details

20. Bestair LN2025-13C Furnace Filter, 20″ x 25″ x 5″, Lennox Odor Eliminating Replacement, MERV 13

Bestair LN2025-13C Furnace Filter, 20

  • Designed to perform with high efficiency and minimum pressure drop; conserving energy and lowering costs
  • Minimum Efficiency Reporting Value (MERV) of 13; generating the best filtration with fewer particles and contaminants that pass through the filter

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Sold By Price
Walmart – METROGOODS USA
Home Depot
Blain’s Farm & Fleet
The BuildClub

Product Details

Specifications

Details
Captures Smog Yes
Air Filter Longevity (Months) 6
Works with Air Conditioners No
Captures Pet Dander Yes
Captures Mold Spores Yes

Reviews From Real Customers

Muzz
Jjj1

Conclusion

There are several possible conclusions to this question, but the most likely one is that the person is asking for help troubleshooting a Lennox furnace filter problem. The furnace filter is an important part of the furnace, and if it is not working properly, the furnace will not work properly.

There are a few things that can go wrong with the furnace filter, and the most common problem is that it gets clogged. If the filter gets clogged, it will not be able to do its job properly, and the furnace will not work correctly.

There are a few things that you can do to clean the filter, but if it is really clogged, you may need to replace it.

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