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Reusable Foam Filters for Puritan Bennett 420G, 420S, 420SP, 420E CPAPs and 425 Bilevel (2 Pack)

BY Generic  |  Item #REU1046
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420 & 425 Series Foam Filters (2 pack)

To block even the smallest of particles, the two-pack of Reusable Foam Filters for the Goodknight 420 Series are made of polyurethane foam and will keep your therapy air fresh and clean. The filters are compatible with the following machines:

  • GoodKnight 420G
  • GoodKnight 420S
  • GoodKnight 420SP
  • GoodKnight 420E
  • GoodKnight 425 Bi-Level
  • GoodKnight 425 ST Bi-Level

Designed for the Goodknight 420 Series, these filters are reusable and washable.They should be changed every six months.

What's Included:

  • 2-Pack of Reusable Foam Filters

420 & 425 Series Foam Filters (2 pack)

To block even the smallest of particles, the two-pack of Reusable Foam Filters for the Goodknight 420 Series are made of polyurethane foam and will keep your therapy air fresh and clean. The filters are compatible with the following machines:

  • GoodKnight 420G
  • GoodKnight 420S
  • GoodKnight 420SP
  • GoodKnight 420E
  • GoodKnight 425 Bi-Level
  • GoodKnight 425 ST Bi-Level

Designed for the Goodknight 420 Series, these filters are reusable and washable.They should be changed every six months.

What's Included:

  • 2-Pack of Reusable Foam Filters

Learn More About This Product

In what order do I insert the filters?
If using both a foam and paper filter, the white paper filter is inserted into the filter area first. Some paper filters use the same material on both sides and either side can face into the machine. Other paper filters may have a plastic mesh side and a soft, fuzzy side. Insert the mesh side facing into the machine and the fuzzy side facing out of the machine as shown in the image below.

mesh filter

If the paper filter has a tab, fold it facing out of the machine for easy removal. The foam filter is inserted into the filter area after the paper filter is installed. The foam filter will catch the larger dirt particles first.

If you are using a two colored filter, the colored side faces out as shown in the image below.

S8 Filter
How often should I clean my filters?
Washable foam filters should be cleaned as soon as they become discolored. Manufacturers recommend foam filters be rinsed weekly under clear running water and allowed to air dry before being reinstalled in the machine. If the machine is used in a very dusty environment, the foam filter may require more frequent cleaning.

Disposable filters and bacteria filters are not intended to be cleaned but rather changed out, disposing of the used filter. Manufacturers recommend changing the disposable filter once a month, more frequently if used in a very dusty environment.
How often should I replace my filters?
Reusable foam filters should be replaced when they deteriorate and begin to fall apart, much as a sponge does. The foam filter should be washed with a mild detergent monthly and should be replaced every 3 months or more if the foam is torn.

Disposable fine filters and bacteria filters should be discarded as soon as they become discolored or at least every 30 days.

If you live in a house with pets or smoke, you may need to replace the filters more often.
What are reusable foam filters?
Foam filters are designed to collect larger dirt particles and animal fur. If two filters are used in a machine, the foam filter should be on the outside.

An example of a reusable foam filter is shown below.
M Series Filters
What are disposable fine filters?
Ultra fine filters collect much smaller particles and are useful for those with allergies or sinus issues. These filters are not meant to be cleaned, but discarded when dirty.

An example of a disposable fine filter is shown below.

M Series Fine Filter
What is an In-line Outlet Bacteria Filter for CPAP/BiPAP?
Bacteria filters are fine enough to remove some bacteria and are clinically indicated when a CPAP machine is used by more than one person. However, many CPAP users find them helpful in reducing the occurrence of sinus infections and other nasal issues. Bacteria filters can be used with an CPAP/APAP/ or BiPAP machine.

Bacteria filters are housed in a plastic frame and are placed at the CPAP air outlet, rather than the air inlet. They may be used with humidifiers, but should be removed and allowed to air dry during the day.

This filter is placed at the air outtake for your machine if you are not using a humidifiers. If you are using a humidifier, it is placed at the air outake for your humidifier. The bacteria filter is placed in the air outtake and the CPAP hose is placed on the other end.

The entire housing is disposable and should be discarded as soon as matter becomes visible. A clogged Bacteria filter may affect the amount of air delivered by the CPAP.

An example of a bacteria filter is shown below. Follow by an image showing how it installed.

Bacteria Filter Bacteria Filter Air Flow

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- Verified Customer, 10/25/22

★★★★★

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Customer Reviews

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4.7 44 Reviews
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★★★★★

No problems

Verified purchase | Oct. 01, 2019 | Verified CPAP.com Customer
Glad I could find new filters for my old machine (Puritan-Bennett)
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★★★★★

Exactly what I needed

Verified purchase | Jan. 05, 2019 | Verified CPAP.com Customer
Was glad to see this product is still being made- it was the exact one that was included when I originally got my Cpap
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(0)
★★★★★

Provides longer life for my bacteria filter

Verified purchase | Dec. 05, 2017 | Verified CPAP.com Customer
I use these foam filters, along with my Puritan Bennet bacteria filters, to filter out larger dust particles first. This extends the useful life of my bacteria filters and saves me money.
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★★★★★

Filter review

Verified purchase | May. 16, 2017 | Verified CPAP.com Customer
These are the right size and work well!
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(0)
★★★★★

Reusable Foam Filters for Puritan Bennett 420 Cpaps

Verified purchase | Sep. 24, 2015 | Verified CPAP.com Customer
Great product for the first line of defense in the filtering of cpap intake air stage. It's the first step to overall clean air and better health.
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(0)
★★★★★

they work

Verified purchase | Jan. 13, 2015 | Verified CPAP.com Customer
that's it- nothing fancy
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