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IMPROVE YOUR DEFENCE The Blue Pure 3450i AllergenBlock Blueair Filter is designed for optimal performance; compatible with the 3450i air purifier (B08KPHSY69) Reinforced allergy protection: the AllergenBlock protective layer neutralises over 90 percent of allergenic properties such as sneezing dust, pollen and pet hair, which can trigger discomfort AUTOMATIC FILTER CHANGE: Subscribe and save up to 15 percent on automatically delivered filters when they need to be replaced; with a 24-hour operation, your Blueair filter should be replaced every 6 months to effectively reduce pollutants and allergens in the air Sneeze causing allergens: four layers of air purifier filtering; allergenblock defense layer neutralises over 90 percent of pollen, dust and pet hair on the Blueair filter; carbon layer reduces light household odors