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Use this as a primary filter with your Blueair filter and extend the life of the Blueair filter by multiples of months. Cut to size and use Frog tape or equivalent to hold in place on the inlet side of the Blueair filter. Change as needed or every 2-3 months, this will extend the life of the Blueair filter by multiples of months and save you a large amount of money. I have saved over $200 on the $49 filters for my 203 series Blueair by extending the life span of the Blueair 203 filter to more than 2 years. Very economical.
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