Perfect Compatibility Designed specifically for the LUNINO K2, ensuring seamless installation and optimal performance 3-Stage Filtration System Combines a Washable pre-filter, True HEPA filter, and activated carbon layer Washable & Reusable Pre-Filter Help extends the life of the main filter, improves overall efficiency, and helps reduce long-term maintenance costs Large Area Coverage Suitable for spaces up to 3,000 sq.ft, making it ideal for living rooms, bedrooms, and open-concept areas How to Use Open the filter compartment, remove the old filter, insert the new one (align using the directional arrows), close the compartment, and press the power button to restart.