Compatible With: Hamilton Beach TrueAir 04712 04381 Allergen Reducer 840117900 True-Air O4712 O4381. To change the filter: Remove the front grille then remove the used filter by grip-ping the sides and pulling outward. Discard the used filter as it cannot be cleaned. The Allergen Reducer is designed to filter the room three times per hour at high speed. NOTE that factors such as room's shape and ceiling height can affect this rate. It is normal that the air flow will be reduced as the filter becomes clogged. Replace the filter as needed. The life of the filter is determined by use. If the Allergen Reducer is used continuously, it may need to be replaced after 1 month. If only used occasionally, it may last up to 4 months. Filter life will depend on use and allergy season.
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