Offered in OEM and VALUE compatible filters which are of the same material and quality as the OEM filters. May be black or white foam. 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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