Excellent Value: Replacement filter for air purifiers, effectively filters air particles for healthier living. Dimensions: 14" x 10" x 9" inches Compatibility: Compatible with Blueair All 500/600 Series Purifiers 501, 503, 505, 510, 550E, 555EB, 601, 603, 605, 650E. Not OEM; by LifeSupplyUSA. Quality HEPA Filtration: High-Efficiency Particulate Air (HEPA) design filters fine particles and irritants. Professional Grade: LifeSupplyUSA Air Purifier Filters are durable and efficient, ensuring maximum airflow and device protection. Easy Installation: Tool-free; replace every 6 months (depending on air quality and use) for optimal performance. Replacement air purifier filter by LifeSupplyUSA, designed to help maintain cleaner indoor air. Sealed for freshness and durability, this filter provides high-quality filtration to improve air quality in your home or office.