Fits checked Oct 1, 2026 · How we check
Filter Fit Finder
Menu

Lennox · media air cleaner filter

Lennox HCF20-11 MERV 11 (X6673)

Healthy Climate HCF20-11 Disposable Pleated Box Filter, MERV 11. Part X6673. Lasts up to 12 months. Fits 1 model and their listed variants.

Buy HCF20-11 MERV 11 on AmazonManufacturer page

Opens an Amazon search for Lennox HCF20-11 MERV 11 X6673. Check the listing says X6673.

Fits these models

Part numbers

Genuine part
X6673
Also listed as
HCF20-11
How often
Lasts up to 12 months
What is in it
MERV 11 pleated box filter
Size
20 x 25 x 5 in nominal; actual 19-3/4 x 24-3/4 x 4-3/8 (Lennox handbook) or 20-3/4 x 24-3/4 x 4-3/8 (LennoxPROs page)

Sources

  • Which filter fits lennox.com Maker's own page checked Oct 1, 2026
    Lennox HCC engineering handbook (ehb_hcc_2402), PDF p4: MERV 11 table, cabinet HCC20-28, box filter HCF20-11, 'Replacement Box Filter X6670 X6673' (HCC16-28, HCC20-28)
  • How often lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: 'Filter estimated service life (months) Up to 12 months'
  • Model variants m.lennoxpros.com Maker's own page checked Oct 1, 2026
    'Healthy Climate HCC20-28, Media Filter Cabinet, 20 x 25 x 5 Inch Nominal' Cat# X6661; MERV 11 X6673, X8304, X8310; MERV 13 19L17; MERV 16 X6675, X8307, X8313; no filter included
  • Size lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: HCC20-28 actual filter size '19-3/4 x 24-3/4 x 4-3/8'
  • Other genuine options lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: MERV 13 HCF20-13 'Replacement Box Filter 19L16 19L17'; PDF p5: MERV 16 'Replacement Box Filter X6672 X6675', expandable 'X8306 X8307', media only 'X8312 X8313'
Show all 8 sources

Which filter fits

  1. lennox.com Maker's own page checked Oct 1, 2026
    Lennox HCC engineering handbook (ehb_hcc_2402), PDF p4: MERV 11 table, cabinet HCC20-28, box filter HCF20-11, 'Replacement Box Filter X6670 X6673' (HCC16-28, HCC20-28)
  2. lennox.com Maker's own page checked Oct 1, 2026
    Handbook ehb_hcc_2402 (Feb 2024), PDF p4, Specifications - Furnace Models MERV 13 and MERV 11: cabinet HCC20-28, filter model (box filter) HCF20-11, MERV 11, nominal 20 x 25 x 5, actual 19-3/4 x 24-3/4 x 4-3/8, 'Replacement Box Filter' X6673; PDF p7 Cabinet and Filter Combinations lists HCC20-28 with HCF20-11
  3. lennoxpros.com Maker's own page checked Oct 1, 2026
    'Healthy Climate HCF20-11, Disposable Pleated Box Filter 25 x 20 x 5 Inch, MERV 11' Cat # : X6673 Model/Part # : HCF20-11

How often

  1. lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: 'Filter estimated service life (months) Up to 12 months'

Model variants

  1. m.lennoxpros.com Maker's own page checked Oct 1, 2026
    'Healthy Climate HCC20-28, Media Filter Cabinet, 20 x 25 x 5 Inch Nominal' Cat# X6661; MERV 11 X6673, X8304, X8310; MERV 13 19L17; MERV 16 X6675, X8307, X8313; no filter included

Size

  1. lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: HCC20-28 actual filter size '19-3/4 x 24-3/4 x 4-3/8'
  2. lennoxpros.com Maker's own page checked Oct 1, 2026
    LennoxPROs X6673 'Healthy Climate HCF20-11 ... 25 x 20 x 5 Inch, MERV 11'; actual '20-3/4 x 24-3/4 x 4-3/8'; listing notes it has been replaced by another catalog number (not named)

Other genuine options

  1. lennox.com Maker's own page checked Oct 1, 2026
    PDF p4: MERV 13 HCF20-13 'Replacement Box Filter 19L16 19L17'; PDF p5: MERV 16 'Replacement Box Filter X6672 X6675', expandable 'X8306 X8307', media only 'X8312 X8313'