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Carrier · humidifier · whole house bypass

Carrier HUMCRWBP replacement filter

Use part P110-4545. Replace at least twice per heating season (owner's manual).

The filter that fits

Maker lists this model

Carrier P110-4545 pad

Carrier Humidifier Pad P110-4545

Part number
P110-4545
How many
1 per unit
How often
Replace at least twice per heating season (owner's manual)
Buy P110-4545 pad on AmazonManufacturer page

Opens an Amazon search for Carrier P110-4545 pad. Check the listing says P110-4545.

See the sources

Look-alike models that take a different filter

The HUMCRSBP and HUMCRLBP bypass models use aluminum pads P110-1045 and P110-3545.

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 carrier.com Maker's own page checked Oct 1, 2026
    Page title 'Performance™ Water-Saver Bypass Humidifier | HUMCRWBP'; its Documents list links 'Owner's Manual for Bypass and Fan Powered Humidifiers' (OM-HUMCRBP-01.pdf), the manual whose pad step names the Part No. for this humidifier. The manual itself prints no model code.
  • How many brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, maintenance steps slide the single Humidifier Pad out of the scale control insert and slide a new one in
  • How often brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, PDF p3: 'It should be changed annually with the exception of the Water Saver humidifier which should be replaced at least twice per heating season'
Show all 6 sources

Which filter fits

  1. carrier.com Maker's own page checked Oct 1, 2026
    Page title 'Performance™ Water-Saver Bypass Humidifier | HUMCRWBP'; its Documents list links 'Owner's Manual for Bypass and Fan Powered Humidifiers' (OM-HUMCRBP-01.pdf), the manual whose pad step names the Part No. for this humidifier. The manual itself prints no model code.
  2. brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, PDF p7 (Water Saver): 'Slide a new Humidifier Pad Part No. P110-4545 (7) into the scale control insert/float chamber'
  3. carrier.com Maker's own page checked Oct 1, 2026
    Page for the HUMCRWBP (per its URL): Performance™ Water-Saver Bypass Humidifier; At a glance Type Bypass Evaporator Pad Expanded paper
  4. brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, 'Humidifier Pad (Part No. P110-4545)'

How many

  1. brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, maintenance steps slide the single Humidifier Pad out of the scale control insert and slide a new one in

How often

  1. brandportal.carrier.com Maker's own page checked Oct 1, 2026
    Carrier owner's manual OM-HUMCRBP-01 (B2207853A, © 2018 CAC/BDP), linked as a document from the carrier.com page for this model, PDF p3: 'It should be changed annually with the exception of the Water Saver humidifier which should be replaced at least twice per heating season'