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Lennox X6673 Filter MERV 11 20x25x5 Sale $32.99 Furnace Filter Free Shipping Best Prices in 2019

Lennox X6673 MERV 11 Original Filter Replacement 20x25x5 Sale $34.95 Free Shipping

Lennox X6673 Filter 20x25x5 MERV 11 Original Replacement HCF20-16 Sale $32.99

Original Lennox X6673 Filter Sale by Atomic Features great pricing on 1 pack and 2 packs of the X6673 20x25x5 MERV 11 Original Filter Replacement HCF20-16 starting at $32.99. Atomic also carries a high quality compatible made in the USA sold as a 2 pack for 49.95 so no need to drive to Home Depot or Lowes hoping they stock your x6673 replacement filter since you can have it come straight to your front door by ordering your filters online for the best price.

USE Discount Code FALLFIVE19X6673 at checkout. Offer Ends Oct 31 2019.


BUY Lennox X6673 Filter 1 Pack NOW

BUY Lennox X6673 Air Filter 2 Pack NOW

BUY Atomic X6673 Compatible 2 Pack $49.95 NOW


About Lennox X6673 Filters

Lennox makes superior quality air filters. Atomic Filters stocks an extensive selection of the Lennox brand air filters including the popular X6673 air filters. The Lennox X6673 also known as the X6673 MERV 11 Air Cleaner Filter Media for HCC20-28 - 20x25x5 is compatible with a wide variety of systems including Honeywell, Trion Airbear and Carrier. The Lennox filter X6673 is part of the Lennox healthy climate filters.

  • Nominal size 20" x 25" x 5"
  • Actual size 19 7/8" x 24 3/4" x 4 3/8"
  • Model X6673 is a Lennox 20x25x5 Air filter
  • 98% efficient filtration media
  • Recommended Replacement Every 2 to 3 Months

How to Get The Right Filter Size

When it comes to filters both size and compatibility matter. It is however important when looking for a compatible filter to understand filter sizing to make sure it is compatible with the exact model. First, you need to consider the actual size of the filter and make sure its actual dimensions match the filter you are replacing. Air filters are generally listed by their nominal size which can cause some confusion with consumers.  What you might not realize is that filters are not sold by their actual dimensions. Instead, a rounded up number is used to label filter packages. This measurement is referred to as the "Nominal Size".

Lennox X6673 VS X6675

Lennox 20x25x5 air filter choices include the option to upgrade the X6673 MERV 11 to the X6675 MERV 16 furnace filter. The X6675 can also be used to upgrade the following Honeywell furnace filters to MERV 16: Replaces Honeywell FC35A1027, FC100A1037, FC200E1037. The Following Carrier filters can be upgraded to MERV 16 furnace filters: Carrier/Bryant EXPXXFIL0020, EXPXXUNV0020, EXPXXLMC0020. Both the Lennox X6675 and the X6673 are the correct Lennox 20x25x5 air filter replacements for these Carrier and Honeywell furnace filters.

X6673 Lennox OEM 20x25x5 Original HCF20-16 Replacement - 2 Pack $65.44

Lennox X6673 Best Deals

Atomic Filters High-Quality Compatible Filter for the Lennox X6673 -2 pack $49.95



 The X6673 Compatible by Atomic is the perfect replacement filter for your Lennox furnace filter. High Quality and great value are hallmarks of the Atomic Band air filters.

Lennox X6673 compatible furnace filter by Atomic


Atomic Compatible for Lennox Model X6673 Air Cleaner Filter Media - 20" x 25" x 5" (2-Pack) FEATURES: Compatible for Factory originalBMAC Healthy Climate Media Electrostatically charged disposable media Captures dust mites, pollen, mold spores, pet dander and other contaminants down to 0.3 microns Synthetic media offers large surface area for maximum dirt holding capacities with minimum air resistance Media is certified to UL 900 standard. UL classification - Class 2 Replace every 6 months under normal use SPECIFICATIONS: Nominal Dimensions: 20" x 25" x 5" Actual Dimensions 19-3/4" X 24-3/4" X 4-3/8" MERV 11 Fits Air Cleaner Fits Lennox® and Healthy Climate model # HCF20-16, HCF20-10, BMAC-20C, HCXF20-15, HCC20-28, HCF20-10 and HCF20x16.
Nominal size 20" x 25" x 5" (Actual size 19 7/8" x 24 3/4" x 4 3/8")


  • 1067
  • 1024
  • 1032
  • 1038
  • 2010
  • 2044
  • F25A1068
  • F100-1037
  • F150E-1034
  • F200E-1037


Trion Air Bear

  • 453000-001
  • 455602-001
  • 447380-002
  • Supreme 2000


  • MPKA
  • MACA
  • MPKA0020
  • EZXCAB020
  • FILCABCC0020

Furnace Filters

16x25x1 Air Filter

16x20x1 Air Filter

20x25x1 Air Filters

How to Choose The Right Home Air Filter Everytime

Check out the Best Deals on the X6673 Lennox healthy climate filters.



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Nominal Vs. Actual Sizes: Finding the Right Air Filter Size

Buying the Correct Size Air Filter- The Most Important Thing to Know 

When you are buying your air filter online most important thing to know is Air Filters have two sizes that you need to understand the Nominal size and the Actual Size. Not understanding these numbers often leads to consumers purchasing a filter that does not fit their Furnace or HVAC system. See the complete list of Air Filters by Size Rating and Brand.

Nominal vs Actual air filter size by Atomic


Understanding Nominal Filters Size Could Save You Time and Money

Not understanding the Nominal Filter Size is the primary culprit for incorrectly purchased filters.The Nominal Size is the usually the dimensions used to Label the filter. For instance 16x20x1. These dimensions are a rounded value on the filters actual measurements. The actual measurements on this filter may be 15.5x19.5x.75, but that could vary by brand and manufacturer. So in order to make sure you have the correct size filter, especially if you are replacing with a different brand it is important to confirm the actual size on the filter. When purchasing filters on the internet the Nominal size is usually found in the product title.

Actual Filter Size- The Key to Making the Right Replacement Filter Purchase

The actual size as you might have guessed are the actual dimensions of the filter by length, width and thickness. This size is often on the filter right below the Nominal size and is usually labeled as the actual size. When you are buying a filter online the actual size is sometime in the product bullet point or the product description. If your filter does not have actual dimensions on the outside of the filter, you can measure you filter to get the correct dimensions. Some brands have a foam gasket on the outside of the filter, in this case, you will want to make sure you have a compatible actual size and that it also has the foam to ensure a snug fit. 

Lennox Air Filter X0851 with Foam strips

Examples of Nominal and Actual Sizes

 Size  Example 1  Example 2
Nominal Size 20x20x1 16x20x1
Actual Size 19.5x19.5x.75 15.75x19.75x.75


 Furnace filters should fit securely but should not have to be forced into position. If you have to force the filter into its slot, then it is probably too big. Forcing an improper filter size in a filter can cause it to buckle, damaging the filter or reducing its ability to function properly. Filters are a smaller than their slot to allow for easy replacement. Some HVAC units may need a filter with dimensions that are unique or uncommon. In these cases, a custom filter needs to be ordered.

Find Your Filter Sizes Easy in 1" Deep Filters , 2" Deep Filters, 4" Deep Filters