Home Revolution 3 Replacement HEPA Filters, Fits Blueair 500/600 Series 501, 503, 505, 510, 550E, 555EB, 601, 603, 605, 650E Air Purifier Models Designed to fit: Blueair 500/600 series 501, 503, 550E, 601, 603, and 650E air purifier models, compare to Blueair part # 501, 503, 550E, 601, 603, and 650E Replace with confidence: We back all of our products with a 100% satisfaction guarantee Breathe easy: Genuine HEPA filter removes even the smallest particles of allergens, impurities, and odors from the air and refreshes your home The Home Revolution Mantra: High-quality replacement products at a low price What you get: 3 HEPA air purifier filters