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Filters Fast® Replacement for Lennox X6673 20x25x5 MERV 11 Healthy Climate Furnace & AC Air Filter - 2-Pack

$34.98 per Filter
Retail: $99.99
You Save: 30%
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Lennox X6673 20x25x5 MERV 11 Healthy Climate Furnace & AC Air Filter

Retail: $80.99
You Save: 24%
Ships in 1 to 2 business days.
Compare & SaveUse the table below to compare
6 - 12 Months
Filter Life
6 - 12 Months
MERV Rating
Reduces Dust
Reduces Pollen
Reduces Mold Spores
Reduces Pet Dander
Reduces Smoke & Smog
Reduces Allergens
Reduces Bacteria
Reduces Virus Carriers
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Product Information
Filters Fast FF20255X6673M11
Lennox X6673

The Lennox X6673 20x25x5 MERV 11 Healthy Climate Furnace & AC Air Filter contains a 98% efficient filtration media that can capture particles as small as 0.3 microns before they collect on coils. This Lennox Pleated Filter Media is a high-efficiency alternative to one-inch filters that offers greater dust-holding ability.


  • Brand: Lennox
  • Part Number: X6673
  • Nominal Dimensions: 20" x 25" x" 5"
  • Actual Dimensions:19-3/4" x 24-3/4" x 4-3/8"
  • MERV Rating: 11

How do you install the Lennox X6673?

  1. Unwrap the new Lennox X6673 filter and place it in front of the old one so that you can see the bottom of the old filter.
  2. Use a vacuum cleaner to remove any dirt from around the old filter.
  3. Remove any obstructions from behind or below the furnace.
  4. Remove any debris from around the furnace itself.
  5. Ensure that no edges or corners are tucked into another compartment.
  6. Line up tabs on top of the filter with slots on top of the blower.
  7. Locate arrows on the backside of the frame.
  8. Align frame with slots on top of the blower.
  9. Press down on the frame until it locks.

How often should you replace the Lennox X6673?

  • Changing your Lennox X6673 is a very quick and easy process that should be done once every six to twelve months.

What contaminants does the Lennox X6673 reduce?

  • The Lennox X6673 is a MERV 11 air filter, which means that it reduces the following contaminants:

    • Dust
    • Pollen
    • Mold Spores
    • Pet Dander
    • Smoke & Smog
    • Allergens

Compatible Parts:

The Lennox X6673 is the correct replacement for the following part numbers:

Part Number
No results for {X}

Compatible Models:

The Lennox X6673 is correct replacement for the following model numbers:

BrandModel NumberDescription
Carrier EZXCAB020 Air Cleaner
Carrier FILCABCC0020 Air Cleaner
Carrier MACA Air Cleaner
Carrier MPKA Air Cleaner
Carrier MPKA0020 Air Cleaner
Honeywell 1024 Air Cleaner
Honeywell 1032 Air Cleaner
Honeywell 1038 Air Cleaner
Honeywell 1067 Air Cleaner
Honeywell 2010 Air Cleaner
Honeywell 2044 Air Cleaner
Honeywell F100-1037 Air Cleaner
Honeywell F150E-1034 Air Cleaner
Honeywell F200E-1037 Air Cleaner
Honeywell F25A1068 Air Cleaner
Trion Air Bear 447380-002 Air Cleaner
Trion Air Bear 453000-001 Air Cleaner
Trion Air Bear 455602-001 Air Cleaner
Trion Air Bear SUPREME 2000 Air Cleaner
No results for {X}


Customer Reviews

Total Reviews: 21 | Average Rating: 4.6 / 5.0

Raymond White2023-06-02

Quality & we have always bought these filters.

Collected by
Donna Richard2023-05-10

I love these air filters, my house is kept clean and just about dust free. A++ product

Collected by

Exactly what I ordered and delivery very prompt

Collected by
Diane D2022-09-05

Really good quality

Collected by


Collected by

Great product, easy to install.

Collected by

The filter arrived in poor condition due to being crushed flat in the middle.

Collected by
Linda Sparks2022-04-16

I received my order in just days and was able to get the quality I wanted.

Collected by
Jeffrey Ferguson2022-03-04

Great service

Collected by
Jeffrey Marks2022-02-10

Very pleased with the quality

Collected by
Robert Caragol2022-02-08

Very efficient

Collected by
Steele Kimberly2021-11-17

This filter keeps dust to a minimum,

Collected by
jeff s.2021-11-09

Well , it’s a filter. Fits my Lenox furnace perfectly. Gives me peace of mind

Collected by
Bruce Mathison2021-10-13

Great filters and great value!

Collected by

What I wrote before. Look it up.

Collected by

Great filter. Came quickly.

Collected by

This is the same as the higher priced filters but for a lot less.

Collected by

It has been a fine product.

Collected by
Marsha Failor2021-03-28

The 5 inch filter is great to catch all the allergens in my house. Although I have a new HVAC unit of 2 years, replacing the filters every 6 months is necessary in FL.

Collected by
Jeffrey Marks2021-03-19

Excellent quality filters

Collected by

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