Filter Fit FinderLennox · media air cleaner · media air cleaner cabinet
Lennox Healthy Climate HCC20-28 replacement filter
Use part X6673, or any one of 19L17 or X6675. Lasts up to 12 months.
Any one of these fits · first listed
Maker lists this modelLennox HCF20-11 MERV 11
Healthy Climate HCF20-11 Disposable Pleated Box Filter, MERV 11
- Part number
- X6673also sold as HCF20-11
- How many
- 1 per unit
- How often
- Lasts up to 12 months
- Size
- 20 x 25 x 5 in nominal; actual 19-3/4 x 24-3/4 x 4-3/820 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)
Lennox's handbook does not say how many filters the cabinet holds; we list one.
Opens an Amazon search for Lennox HCF20-11 MERV 11 X6673. Check the listing says X6673.
Does your exact model share this filter?
Lennox labels several versions of the Healthy Climate HCC20-28. Check the label on your unit.
- Healthy Climate HCC20-28 takes X6673
- X6661 same filter · Lennox catalog number for the cabinet
Look-alike models that take a different filter
The HCC16-28 and HCC20-28 are the furnace cabinets (16 x 25 and 20 x 25 nominal filters); the HCC08-21, HCC10-22, HCC14-23, HCC19-22 and HCC19-25 are air-handler cabinets with their own sizes. The HCC08-21 and HCC14-23 share filters, as do the HCC19-22 and HCC19-25.
Other genuine options from Lennox
Variants and kits the maker sells for this model. Same fit, different media or packaging.
- HCXF20-11 expandable filter, frame and media / media only
X8304 / X8310 · Find on Amazon - HCXF20-16 expandable filter, frame and media / media only
X8307 / X8313 · Find on Amazon
Compatible alternatives (retailer claims)
These fits are claimed by the seller, not by Lennox. We list them for completeness and label them.
- Filterbuy Lennox 20x25x5 (MERV 8, 11 or 13) Retailer claim
20x25x5 'Compatible with: X0586, X6673, X5426'; actual 19 5/8 x 24 3/8 x 4 3/4; Filterbuy-made
Seller's page
Sources
High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.
- 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 12 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)
- 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
- 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) HCF20-13, MERV 13, nominal 20 x 25 x 5, actual 19-3/4 x 24-3/4 x 4-3/8, 'Replacement Box Filter' 19L17; PDF p7 Cabinet and Filter Combinations lists HCC20-28 with HCF20-13
- lennox.com Maker's own page checked Oct 1, 2026
Handbook ehb_hcc_2402 (Feb 2024), PDF p5, Specifications - Furnace Models MERV 16 and Air Handler Models MERV 11: cabinet HCC20-28, filter model (box filter) HCF20-16, MERV 16, nominal 20 x 25 x 5, actual 19-3/4 x 24-3/4 x 4-3/8, 'Replacement Box Filter' X6675; PDF p7 Cabinet and Filter Combinations lists HCC20-28 with HCF20-16
- 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
- lennox.com Maker's own page checked Oct 1, 2026
PDF p4: 'Filter estimated service life (months) Up to 12 months'
- lennox.com Maker's own page checked Oct 1, 2026
PDF p5: '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
- 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
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'
- 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
- 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'