The Skuttle 448-002 (also called the 000-0448-002) is the correct replacement filter for the following air cleaners:
The Skuttle Air Cleaner Filter Replacement for DB2520 is a replacement air filter for the Skuttle DB-25-20 Air Cleaner. The deep-pleated, MERV 8 filter media of this replacement filter provides high-volume service that traps airborne particles to provide cleaner indoor air quality. Skuttle recommends a filter replace every 6 to 12 months in order to achieve the highest possible filtration results from your air cleaner.
Skuttle Air Cleaner Filter Replacement for DB2520 specifications: