General description High-efficiency Core 300 replacement air filter captures 99.97% of airborne particles and odors, making it ideal for households with pets, cooking, and smokers. It is recommended to replace the filters every 6-8 months to maintain optimal performance. Technical specifications Part number: Core 300-RF Dimensions: 193 x 150 mm Material: Plastic Color: White Package Contents: 1 x Air Purifier Filter, 1 x Brush Measurement allowed error: +/- 1-3 cm Compatibility and accessories Compatible with Core 300 air purifier and Core P350 air purifier Replacement part numbers: Core 300-RF and Core P350-RF Usage For best performance, use only replacement filters specifically designed for the Core 300 and Core P350 air purifiers. Each air purifier is performance tested as a system with the filters for optimal efficiency.