The GoodKnight 420/ 425 Pollen Foam Filters are used with the GoodKnight models that were manufactured by Puritan Bennett.
The filters can be used with the following models:
GoodKnight 420G
GoodKnight 420S
GoodKnight 420SP
GoodKnight 420E
GoodKnight 425
The filters are recommended to be replaced every 3 months, but to be cleaned every month! When using with a ultra fine filter, place the ultra fine filter in first and then the foam filter.
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