Air Purifiers with a hepa filter?

which one is the best? The quietest? Provides the most relief?
It seems I may have developed some health issues from my sweet little African Grey’s dander. Getting rid of him is not an option. Currently have Bronchial Sinusitis… on Advair and Keflex…. and the Doctor suggested I get a purifier with a hepa filter. Which one do I buy?


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