Lennox · humidifier · whole house bypass

Lennox HCWB3-12 replacement filter

Use part X2660. Replace annually or if performance drops.

The filter that fits

Maker lists this model

Lennox X2660 (#10) water panel

Healthy Climate #10 Replacement Humidifier Water Panel

Opens an Amazon search for Lennox X2660 (#10) water panel. Check the listing says X2660.

Lennox labels several versions of the HCWB3-12. Check the label on your unit.

HCWB3-12 takes X2660
HCWB3-12A same filter
HCWB3-12K same filter
HCWB3-12AK same filter
HCWB12 not confirmed by Lennox · Current model name; lennox.com's HCWB17/HCWB12 page links the HCWB3 manual

The larger HCWB3-17 takes the #35 panel X2661.

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 lennoxpros.com Maker's own page checked Oct 1, 2026
Lennox X2660, Healthy Climate #10 Replacement Humidifier Pad ... Replacement Humidifier Pad for Healthy Climate Humidifiers: HCWB2-12, HCWB2-12A, HCWB3-12, HCWB3-12A
How many lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, maintenance steps slide the single humidifier pad out of the scale control insert and insert a new one
How often lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4: 'For best performance, you should replace the humidifier pad in your humidifier at least annually' ... 'Replace Humidifier Pad annually or if performance drops'
Size lennoxpros.com Maker's own page checked Oct 1, 2026
Additional Information 10 x 9.75 x 1.75"; Packaged 10/Case

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lennoxpros.com Maker's own page checked Oct 1, 2026
Lennox X2660, Healthy Climate #10 Replacement Humidifier Pad ... Replacement Humidifier Pad for Healthy Climate Humidifiers: HCWB2-12, HCWB2-12A, HCWB3-12, HCWB3-12A
lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4: 'Replace Humidifier Pad annually or if performance drops (Catalog No. X2660 for Models HCWB3-12, HCWB3-12K, HCWB3-12A and HCWB3-12AK, and Catalog No. X2661 for Models HCWB3-17 ...)'
lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4 (Required Maintenance, HCWB3 models): 'Turn the integral bypass damper (3) to the SUMMER position'

lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, maintenance steps slide the single humidifier pad out of the scale control insert and insert a new one

lennox.com Maker's own page checked Oct 1, 2026
Lennox Healthy Climate humidifier operating manual (form 10009367, 04/2011; covers HCWB3-12, -12K, -12A, -12AK, HCWB3-17, -17K, -17A, -17AK, HCWP3-18 and HCWP3-18A), linked from lennox.com's current HCWB17 and HCWP18 pages, PDF p4: 'For best performance, you should replace the humidifier pad in your humidifier at least annually' ... 'Replace Humidifier Pad annually or if performance drops'

lennoxpros.com Maker's own page checked Oct 1, 2026
Additional Information 10 x 9.75 x 1.75"; Packaged 10/Case