1. All Filters
  2. Lennox

Lennox Air Filters

The Lennox brand is known for high-efficiency, premium air conditioners, furnaces and heat pumps as well as a range of indoor air quality accessories. Lennox air filters and replacement parts are genuine accessories for your whole house air cleaner and HVAC systems. Lennox air filters for furnaces provide protection to your furnace and air conditioning system by preventing a buildup of dust and other airborne impurities, while also keeping the air in your home cleaner and fresher. Regular replacement of Lennox furnace filters keeps airflow at proper levels, helping keep furnace systems, air conditioners, air purifiers and cleaners, and more running properly for a longer system lifespan.
Lennox 91X23

Lennox 91X23 MERV 8 14x20x1 Pleated Air Filter (4 Pack)

List Price: $153.99

Our Price: $76.99

Save: $77.00!
VIEW DETAILS
Replace every 3 months
Lennox 91X24

Lennox 91X24 MERV 8 15x20x1 Pleated Air Filters (4 Pack)

List Price: $115.99

Our Price: $57.99

Save: $58.00!
VIEW DETAILS
Replace every 3 months
Lennox 91X25

Lennox 91X25 MERV 8 18x25x1 Pleated Air Filters (4 Pack)

List Price: $123.99

Our Price: $61.99

Save: $62.00!
VIEW DETAILS
Replace every 3 months
Lennox 98N42

Lennox 98N42 MERV 8 16" x 25" x 1" Pleated Air Filters (4 Pack)

List Price: $115.99

Our Price: $57.99

Save: $58.00!
VIEW DETAILS
Replace every 3 months
Lennox 98N43

Lennox 98N43 MERV 8 20x20x1 Pleated Air Filters (4 Pack)

List Price: $125.99

Our Price: $62.99

Save: $63.00!
VIEW DETAILS
Replace every 3 months
Lennox 98N44

Lennox 98N44 MERV 8 20x25x1 Pleated Air Filters (4 Pack)

List Price: $121.99

Our Price: $60.99

Save: $61.00!
VIEW DETAILS
Replace every 3 months
Lennox 98N45

Lennox 98N45 MERV 8 14x25x1 Pleated Air Filters (4 Pack)

List Price: $127.99

Our Price: $63.99

Save: $64.00!
VIEW DETAILS
Replace every 3 months
Lennox 98N46

Lennox 98N46 MERV 8 16x20x1 Pleated Air Filters (4 Pack)

List Price: $123.99

Our Price: $61.99

Save: $62.00!
VIEW DETAILS
Replace every 3 months
Lennox X0581

Lennox X0581 Furnace Filter 16x25x3 MERV 10

List Price: $117.99

Our Price: $58.99

Save: $59.00!
VIEW DETAILS
Replace every 6 months
Lennox X0582

Lennox X0582 MERV 10 16x20x5 Air Cleaner Filter

List Price: $103.99

Our Price: $51.99

Save: $52.00!
VIEW DETAILS
Replace every 6 months
Lennox X0583

Lennox X0583 MERV 11 16x25x5 Box Media Air Cleaner Filter

List Price: $105.99

Our Price: $52.99

Save: $53.00!
VIEW DETAILS
Replace every 6 months
Lennox X0584
  • 5 Stars
  • (1)

Lennox X0584 16x26x5 Furnace Filter MERV 11

List Price: $117.99

Our Price: $58.99

Save: $59.00!
VIEW DETAILS
Replace every 6 months
Lennox X0585
  • 5 Stars
  • (1)

Lennox Genuine OEM Replacement Media Filter X0585, 20x20x5

List Price: $107.99

Our Price: $53.99

Save: $54.00!
VIEW DETAILS
Replace every 6 months
Lennox X0586

Lennox X0586 MERV 11 20x25x5 Box Media Air Cleaner Filter

List Price: $105.99

Our Price: $52.99

Save: $53.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X0587

Lennox X0587 MERV 11 20x26x5 Box Media Air Cleaner Filter

List Price: $119.99

Our Price: $59.99

Save: $60.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X1152

Lennox X1152 Air Bear Media Filter 20x25x5 MERV 11

List Price: $91.99

Our Price: $45.99

Save: $46.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X6664
  • 4.5 Stars
  • (1)

Lennox X6664 MERV 11 17x26x4 Pleated Air Filter

List Price: $97.99

Our Price: $48.99

Save: $49.00!
VIEW DETAILS
Replace every 6 months
Lennox X6666

Lennox X6666 MERV 16 17x26x4 Pleated Air Filter

List Price: $301.99

Our Price: $150.99

Save: $151.00!
VIEW DETAILS
Replace every 6 months
Lennox X6667
  • 5 Stars
  • (2)

Lennox X6667 21x26x4 MERV 11 Air Filter

List Price: $109.99

Our Price: $54.99

Save: $55.00!
VIEW DETAILS
Replace every 6 months
Lennox X6669

Lennox X6669 MERV 16 21x26x4 Air Filter

List Price: $397.99

Our Price: $198.99

Save: $199.00!
VIEW DETAILS
Replace every 6 months
Lennox X6670

Lennox X6670 16x25x5 MERV 11 Healthy Climate Pleated Air Filter

List Price: $95.99

Our Price: $47.99

Save: $48.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X6672

Lennox X6672 Healthy Climate HC16-16 16x25x5 MERV 16 Filter

List Price: $305.99

Our Price: $152.99

Save: $153.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X7935

Lennox X7935 Carbon Clean 20x20x5 Healthy Climate MERV 16 Filter

List Price: $305.99

Our Price: $152.99

Save: $153.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8788

Lennox X8788 MERV 16 PureAir Filter Replacement 20x26x5

List Price: $433.99

Our Price: $216.99

Save: $217.00!
VIEW DETAILS
Replace every 12 months
Lennox X8789

Lennox X8789 MERV 16 Pleated Furnace Filter 16x26x5

List Price: $349.99

Our Price: $174.99

Save: $175.00!
VIEW DETAILS
Replace every 12 months
Lennox X8790

Lennox X8790 Air Filter Replacement 20x21x5 MERV 16

List Price: $395.99

Our Price: $197.99

Save: $198.00!
VIEW DETAILS
Replace every 6-12 months
Lennox Y6604
  • 5 Stars
  • (1)

Lennox Y6604 Carbon Clean Box Media Filter

List Price: $321.99

Our Price: $160.99

Save: $161.00!
VIEW DETAILS
Replace every 12 months
Lennox Y6605

Lennox Furnace Filter Y6605 PureAir 16x26x5 MERV 16

List Price: $269.99

Our Price: $134.99

Save: $135.00!
VIEW DETAILS
Replace every 12 months
Lennox Y6606

Lennox Y6606 Replacement Filter 20x21x5 MERV 16

List Price: $309.99

Our Price: $154.99

Save: $155.00!
VIEW DETAILS
Replace every 12 months
Lennox X5422

Lennox X5422 Healthy Climate MERV 11 20x26x3 Air Filter for PCO-20U

List Price: $121.99

Our Price: $60.99

Save: $61.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X0444

Lennox X0444 MERV 10 Healthy Climate PMAC-12C Filter Media

List Price: $121.99

Our Price: $60.99

Save: $61.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X0445

Lennox X0445 Aprilaire 201 PMAC-20C Filter Media

List Price: $129.99

Our Price: $64.99

Save: $65.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X5424

Lennox X5424 MERV 16 20" x 25" x 6" Air Filter Media

List Price: $415.99

Our Price: $207.99

Save: $208.00!
VIEW DETAILS
Replace every 12 months
Lennox X5425

Lennox X5425 MERV 16 Filter 28x17x6

List Price: $347.99

Our Price: $173.99

Save: $174.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8303

Lennox X8303 Expandable Filter Kit 16x25x5 MERV 11

List Price: $167.99

Our Price: $83.99

Save: $84.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8304

Lennox X8304 Expandable Filter Kit 20" x 25" x 5" MERV 11

List Price: $169.99

Our Price: $84.99

Save: $85.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8305

Lennox X8305 Expandable Filter Kit 20" x 20" x 5" MERV 10

List Price: $159.99

Our Price: $79.99

Save: $80.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8306

Lennox X8306 Expandable Filter Kit 16x25x5 MERV 16

List Price: $453.99

Our Price: $226.99

Save: $227.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8307

Lennox X8307 Expandable Filter Kit 20" x 25" x 5" MERV 16

List Price: $487.99

Our Price: $243.99

Save: $244.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8308

Lennox X8308 Expandable Filter Kit 20" x 20" x 5" MERV 16

List Price: $389.99

Our Price: $194.99

Save: $195.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8309
  • 5 Stars
  • (1)

Lennox X8309 MERV 11 16x25x5 Expandable Replacement Filter

List Price: $109.99

Our Price: $54.99

Save: $55.00!
VIEW DETAILS
Replace every 6 months
Lennox X8310

Lennox X8310 Filter 20x25x5 Expandable Media MERV 11

List Price: $113.99

Our Price: $56.99

Save: $57.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8311

Lennox X8311 Filter 20x20x5 Expandable Media MERV 11

List Price: $111.99

Our Price: $55.99

Save: $56.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8312

Lennox X8312 Expandable Filter Media 16x25x5 MERV 16

List Price: $361.99

Our Price: $180.99

Save: $181.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8313

Lennox X8313 Expandable Media Filter 20x25x5 MERV 16

List Price: $397.99

Our Price: $198.99

Save: $199.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X8314

Lennox X8314 Expandable Media Filter 20x20x5 MERV 16

List Price: $355.99

Our Price: $177.99

Save: $178.00!
VIEW DETAILS
Replace every 6-12 months
Lennox 69H85

Lennox 69H85 Washable Pre-Filter for EAC12-14

List Price: $65.99

Our Price: $32.99

Save: $33.00!
VIEW DETAILS
Replace every 6-12 months
Lennox 69H98

Lennox 69H98 Carbon Air Cleaner Pre-FIlter

List Price: $305.99

Our Price: $152.99

Save: $153.00!
VIEW DETAILS
Replace every 12 months
Lennox 72H02

Lennox 72H02 Whole House System Prefilter

List Price: $65.99

Our Price: $32.99

Save: $33.00!
VIEW DETAILS
Replace every 6-12 months
Lennox 72H09

Lennox 72H09 Charcoal Pre-Filter

List Price: $473.99

Our Price: $236.99

Save: $237.00!
VIEW DETAILS
Lennox 75X66
  • 5 Stars
  • (1)

Lennox 75X66 Metal Mesh Pre-Filter

List Price: $223.99

Our Price: $111.99

Save: $112.00!
VIEW DETAILS
Replace every 1-2 years
Lennox 75X73

Lennox 75X73 Metal Mesh Pre-Filter

List Price: $209.99

Our Price: $104.99

Save: $105.00!
VIEW DETAILS
Replace every 1-2 years
Lennox 92X08

Lennox 92X08 Carbon Foam PreFilter

List Price: $181.99

Our Price: $90.99

Save: $91.00!
VIEW DETAILS
Replace every 12 months
Lennox 92X09

Lennox 92X09 Carbon Inner Filter

List Price: $145.99

Our Price: $72.99

Save: $73.00!
VIEW DETAILS
Replace every 12 months
Lennox X8791
  • 5 Stars
  • (1)

Lennox X8791 Metal Mesh Insert for PCO20-28

List Price: $221.99

Our Price: $110.99

Save: $111.00!
VIEW DETAILS
Replace every 12 months
Lennox 92X10

Lennox 92X10 HEPA Canister Filter Cartridge

List Price: $761.99

Our Price: $380.99

Save: $381.00!
VIEW DETAILS
Replace 2-5 years
Lennox 92X17

Lennox 92X17 HEPA Canister Filter Cartridge

List Price: $511.99

Our Price: $255.99

Save: $256.00!
VIEW DETAILS
Replace every 2-5 years
Lennox 94X98

Lennox 94X98 HEPA Carbon Canister Filter Cartridge

List Price: $303.99

Our Price: $151.99

Save: $152.00!
VIEW DETAILS
Replace every 6 months
Lennox X2678

Lennox X2678 Inner Charcoal Carbon Filter 93017-21

List Price: $111.99

Our Price: $55.99

Save: $56.00!
VIEW DETAILS
Replace every 3 months
Lennox X4137

Lennox X4137 HEPA-20 Carbon Pre-Filter

List Price: $113.99

Our Price: $56.99

Save: $57.00!
VIEW DETAILS
Replace every 12 months
Lennox X4138

Lennox X4138 HEPA-40/60 Healthy Climate Carbon Pre-Filter

List Price: $113.99

Our Price: $56.99

Save: $57.00!
VIEW DETAILS
Replace every 6-12 months
Lennox X4912

Lennox HEPA-20 X4912 HEPA Air Filtration System

List Price: $1,369.99

Our Price: $684.99

Save: $685.00!
VIEW DETAILS
Lennox X4913

Lennox HEPA-40 X4913 Air Filtration System

List Price: $2,667.99

Our Price: $1,333.99

Save: $1,334.00!
VIEW DETAILS
Lennox X4914

Lennox HEPA-60 X4914 Healthy Climate HEPA Bypass Air Filtration System

List Price: $2,439.99

Our Price: $1,219.99

Save: $1,220.00!
VIEW DETAILS
Lennox X5804

Lennox X5804 Air Filter System Kit for HEPA 40 and 60

List Price: $523.99

Our Price: $261.99

Save: $262.00!
VIEW DETAILS
Lennox X8344

Lennox X8344 Upgrade Kit 21x26x4 MERV 16 for Lennox PCO-20C

List Price: $977.99

Our Price: $488.99

Save: $489.00!
VIEW DETAILS
Replace every 12 months
Lennox X8345

Lennox X8345 Upgrade Kit 21x26x4 MERV 16 for Lennox PCO-20C

List Price: $1,099.99

Our Price: $549.99

Save: $550.00!
VIEW DETAILS
Replace every 12 months
Lennox X8346

Lennox X8346 Upgrade Kit 17x26x4 MERV 16 for PCO-12C

List Price: $741.99

Our Price: $370.99

Save: $371.00!
VIEW DETAILS
Replace every 12 months
Lennox X8347

Lennox X8347 Upgrade Kit 17x26x4 MERV 16 for PCO-12C

List Price: $861.99

Our Price: $430.99

Save: $431.00!
VIEW DETAILS
Replace every 12 months
Lennox X8348

Lennox X8348 PCO-20C PureAir Maintenance Kit 21x26x4 MERV 11

List Price: $831.99

Our Price: $415.99

Save: $416.00!
VIEW DETAILS
Replace every 12 months
Lennox X8349

Lennox X8349 Maintenance Kit 17x26x4 MERV 11 for PCO-12C

List Price: $659.99

Our Price: $329.99

Save: $330.00!
VIEW DETAILS
Replace every 12 months
Lennox X8795

Lennox Air Filter PureAir X8795 Maintenance Kit for PCO20-28

List Price: $655.99

Our Price: $327.99

Save: $328.00!
VIEW DETAILS
Replace every 12 months
Lennox X8796

Lennox X8796 Maintenance Kit for PCO16-28 Air Cleaner

List Price: $615.99

Our Price: $307.99

Save: $308.00!
VIEW DETAILS
Replace every 12 months
Lennox X8797

Lennox X8797 Healthy Climate PureAir Maintenance Kit for PCO14-23

List Price: $609.99

Our Price: $304.99

Save: $305.00!
VIEW DETAILS
Replace every 12 months
Lennox Y6608

Lennox Y6608 Annual Maintenance Kit for PCO3-20-16

List Price: $611.99

Our Price: $305.99

Save: $306.00!
VIEW DETAILS
Replace every 12 months
Lennox Y6616

Lennox Y6616 Annual Maintenance Kit for PureAir PCO3-14-16

List Price: $547.99

Our Price: $273.99

Save: $274.00!
VIEW DETAILS
Replace every 12 months
Lennox X6661

Lennox X6661 HCC20-28 Filter Cabinet

List Price: $469.99

Our Price: $234.99

Save: $235.00!
VIEW DETAILS
Lennox X7930

Lennox X7930 Furnace Filter Cabinet HCC14-23, 20x20x5

List Price: $467.99

Our Price: $233.99

Save: $234.00!
VIEW DETAILS
Aprilaire 2210

Lennox Y2109 Aprilaire 2210 Media Air Cleaner MERV 13

List Price: $643.99

Our Price: $321.99

Save: $322.00!
VIEW DETAILS
Aprilaire 2410

Lennox Y2110 Aprilaire 2410 Media Air Cleaner MERV 13

List Price: $611.99

Our Price: $305.99

Save: $306.00!
VIEW DETAILS
Lennox Y2920

Lennox Y2920 Whole House Filter Cabinet

List Price: $469.99

Our Price: $234.99

Save: $235.00!
VIEW DETAILS
Lennox Y2921

Lennox Y2921 Whole House Air Filter Cabinet

List Price: $1,629.99

Our Price: $814.99

Save: $815.00!
VIEW DETAILS
Lennox Y6595

Lennox Y6595 PureAir Air Purification System

List Price: $1,957.99

Our Price: $978.99

Save: $979.00!
VIEW DETAILS
Replace filter every 12 months
Lennox Y6598
  • 5 Stars
  • (1)

Lennox Y6598 PureAir Air Purification System

List Price: $1,947.99

Our Price: $973.99

Save: $974.00!
VIEW DETAILS
Replace filter every 12 months
Lennox Y6601

Lennox Y6601 PureAir Air Purification Filter System

List Price: $2,079.99

Our Price: $1,039.99

Save: $1,040.00!
VIEW DETAILS
Replace filter every 12 months
Lennox Y8905

Lennox Y8905 PureAir S Air Purification System

List Price: $2,787.99

Our Price: $1,393.99

Save: $1,394.00!
VIEW DETAILS
Lennox 64X36

Lennox UV Bulb 64X36 UV Air Filter Lamp Replacement

List Price: $229.99

Our Price: $114.99

Save: $115.00!
VIEW DETAILS
Replace every 12-24 months
Lennox 64x37
  • 5 Stars
  • (1)

Lennox 64x37 UV Lamp Replacement Bulb

List Price: $233.99

Our Price: $116.99

Save: $117.00!
VIEW DETAILS
Replace every 12 months
Lennox 64X56
  • 5 Stars
  • (1)

Lennox 64X56 Lennox UV Lamp Replacement

List Price: $247.99

Our Price: $123.99

Save: $124.00!
VIEW DETAILS
Replace every 12 months
Lennox 64X57

Lennox 64X57 UV Lamp / Bulb Replacement

List Price: $245.99

Our Price: $122.99

Save: $123.00!
VIEW DETAILS
Replace every 12 months
Lennox 64X62

Lennox 64X62 Ballast Replacement for Ultraviolet Germicidal Light

List Price: $529.99

Our Price: $264.99

Save: $265.00!
VIEW DETAILS
Replace every 12 months
Lennox 75X76

Lennox 75X76 Air Filtration System UV Lamp Socket

List Price: $73.99

Our Price: $36.99

Save: $37.00!
VIEW DETAILS
Lennox 91X44

Lennox 91X44 UV Light 230 Volt Power Cord

List Price: $125.99

Our Price: $62.99

Save: $63.00!
VIEW DETAILS
Lennox X4573

Lennox X4573 UV-1000 Air Filtration System

List Price: $1,013.99

Our Price: $506.99

Save: $507.00!
VIEW DETAILS
Lennox X4574

Lennox X4574 Germicidal UV Air Filtration System

List Price: $1,097.99

Our Price: $548.99

Save: $549.00!
VIEW DETAILS
Lennox X4575

Lennox X4575 Germicidal UV Air Filtration System UV-2000

List Price: $1,619.99

Our Price: $809.99

Save: $810.00!
VIEW DETAILS
Lennox X8149

Lennox X8149 Replacement UVA Lamp / Bulb for PCO-12C / PCO-20C

List Price: $133.99

Our Price: $66.99

Save: $67.00!
VIEW DETAILS
Replace once per year
Lennox X8794

Lennox UV Lamp X8794 Pure Air UV Light Replacement

List Price: $117.99

Our Price: $58.99

Save: $59.00!
VIEW DETAILS
Replace every 12 months
Lennox X8927

Lennox X8927 UV Lamp Securing Clips (4 Clips)

List Price: $85.99

Our Price: $42.99

Save: $43.00!
VIEW DETAILS
Lennox X9423

Lennox X9423 Healthy Climate UVC-24V Germicidal UV Light

List Price: $577.99

Our Price: $288.99

Save: $289.00!
VIEW DETAILS
Lennox X9425

Lennox X9425 UV Germicidal Light UVC-41W-D

List Price: $941.99

Our Price: $470.99

Save: $471.00!
VIEW DETAILS
Lennox Y0390

Lennox Y0390 UV Bulb Replacement for UVC-24V

List Price: $163.99

Our Price: $81.99

Save: $82.00!
VIEW DETAILS
Replace every 12 months
lennox Y0391
  • 5 Stars
  • (1)

Lennox UV Bulb Y0391 for UVC-41W-S & UVC-41W-D

List Price: $193.99

Our Price: $96.99

Save: $97.00!
VIEW DETAILS
Replace every 1-2 years
Lennox 27F39

Lennox 27F39 Filter Media Pad 28x32x1

List Price: $54.99

Our Price: $27.99

Save: $27.00!
VIEW DETAILS
Replace every 2 months
Lennox 30023
  • 5 Stars
  • (2)

Lennox 30023 Hammock Filter Material 24 in x 20 ft Roll

List Price: $113.99

Our Price: $56.99

Save: $57.00!
VIEW DETAILS
Replace every 2 months
Lennox 30025

Lennox 30025 Hammock Filter Roll 36 in x 20 ft

List Price: $131.99

Our Price: $65.99

Save: $66.00!
VIEW DETAILS
Replace every 2 months
Lennox 47N69

Lennox 47N69 / 4270 Pleat Spacer

List Price: $89.99

Our Price: $44.99

Save: $45.00!
VIEW DETAILS
Lennox X4141

Lennox X4141 Healthy Climate 8126LA Ventilation Control System LVCS

List Price: $541.99

Our Price: $270.99

Save: $271.00!
VIEW DETAILS
Lennox Y6607
  • 5 Stars
  • (1)

Lennox Y6607 Replacement Cartridge for PC03-20 and PC03-16

List Price: $215.99

Our Price: $107.99

Save: $108.00!
VIEW DETAILS
Lennox Y6621

Lennox Y6621 Replacement PCO Cartridge for PCO3-14-16

List Price: $185.99

Our Price: $92.99

Save: $93.00!
VIEW DETAILS
Replace every 12 months
Lennox X8793

Lennox X8793 Metal Mesh Insert

List Price: $215.99

Our Price: $107.99

Save: $108.00!
VIEW DETAILS
Replace every 12 months
Lennox X8792
  • 5 Stars
  • (1)

Lennox X8792 Mesh Insert for PCO16-28

List Price: $211.99

Our Price: $105.99

Save: $106.00!
VIEW DETAILS
Replace every 12 months
Lennox Y2788
  • 5 Stars
  • (1)

Lennox Y2788 HCWP3-18 Manual Control Power Humidifier 18 GPD

List Price: $707.99

Our Price: $353.99

Save: $354.00!
VIEW DETAILS

Genuine Lennox Filters at Competitive Prices

Lennox manufactures a wide range of OEM replacement filters designed specifically for their Healthy Climate, PureAir, and whole-house air cleaner systems. These include pleated media cartridges, expandable filters, and other products designed for Lennox cabinet specifications. Shopping at All Filters means you get genuine Lennox filters and HVAC accessories at competitive prices and fast nationwide shipping. Need a more affordable option for your Lennox system? You can also shop compatible aftermarket alternatives by SpiroPure.

Finding the Right Lennox Filter for Your System

Lennox filters are often system-specific. The right match depends on your cabinet model, not just the nominal size. Common Lennox filter families include the Healthy Climate series (16x25x5, 20x25x5) and the MERV designated X-series both with numerous subbrands. If you know your Lennox part number (e.g. X6672, X6670, or HCF20-16) you can search directly by part number at AllFilters.com. If you're not sure, search dimensions on our air filters for furnaces page or reach out to our 7-day customer support team.

FAQs on Lennox Air Filters

How to install a Lennox air filter correctly?

Remove the previous filter. Remove any wrapping from the new Lennox air filter, and then make sure the air flow arrows are facing the correct direction in the air cabinet. Slide the filter into the cabinet. For assistance, contact your system technician.
Pleated air filters like Lennox furnace filters and air conditioner filters can usually be used in either system, or an HVAC system with both. Just make sure that you are replacing at least every 12 months for furnace or AC only and every 6 months for HVAC systems.
Yes! Your Lennox air filters can be installed in systems made by other brands as long as they fit the required dimensions. A filter that is too small or too large can allow in dust and other contaminants that can damage the system and compromise your air quality.
All Filters offers a wide selection of Lennox furnace filters in a variety of sizes, including pleated media cartridges, expandable filters, HEPA filters, pre-filters, hammock filters, and more! You can find your replacement filter by size or by part number.
Which air filter Lennox MERV rating you need depends upon system requirements and home life. Before increasing from a traditional MERV 8 for most residential systems, make sure your system can handle it. If it can, MERV 11 makes an excellent choice for those with allergies or who have pets.

Copyright © 2026 All Filters LLC. All rights reserved.