Honeywell HC-818 Humidifier Filter Pad

$19.74 – subscription plans available

$6.58/each (3-pack)

The Honeywell HC-818, also called AC-818, is offered in a convenient case of 3. These filters have a patented rigid support, providing sturdiness throughout the life of the filter. Recommended change is at the beginning of each season or every two (2) months, depending on usage. These filters have an approximate size of 8″ x 9″ x 2″.

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This is the correct replacement filter for these Honeywell Cool Moisture Humidifier models:

  • DH4C
  • DH831

The ideal indoor humidity level is 30-40%. Although levels can vary slightly depending on outdoor temperatures, this range seems to be most ideal in providing the greatest level of comfort by lessening the feeling of dry, itchy skin and irritated or inflammation of nasal passages and airways. You can easily monitor your humidity levels with a simple and inexpensive device called a hygrometer which you can find at your local home improvement stores.

Additional information

Item Number

Model Numbers

Case Size

Filter Features

Equipment Protection
Lint/Heavy Dust Protection
Mold Spores Protection
Settling/Average Dust Protection
Dust Mites Protection
Pollen Protection
Dander Protection
Suspended/Fine Dust Protection
Auto Emissions Protection
Smoke Particles Protection
Bacteria Protection
Sub-Pollen Particles Protection
Attached Viruses Protection
Pollution Protection


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