Usage Tips:1.[Perfect Compatibility] Our replacement LV-H128 filters are perfectly compatible with LEVOIT LV-H128/ ROVACS (RV60)/ PUURVSAS (HM669A) Air Purifier, compared to Part #LV-H128-RF, #HM669A and #RV60, please make sure your model is correct before the order. Please be noted that: This is not an OEM product. Any use of the brand name or model name is intended solely to demonstrate compatibility of this product. 2.[Great Value Package] This package will come with 4 pieces of premium H13 grade true LV-H128 HEPA filters. It is a cost-effective choice to supplement the replacement LV-H128 HEPA filters for your air purifier. It is recommended to replace the filter every 3-6 months to ensure a y air environment for your family or pets. 3.[360 Degree Purification]3 in 1 structure design (1. Nylon Pre-filter; 2. H13 grade true HEPA filter; 3. Activated carbon filter). The LV-H128 HEPA filters of the upgraded version are with stronger capabilities to filter up to 99.9% of smelly smoke, cooking and pet smells, dust, impurities, harmful particles and suspended particles in the air. Just choose our , durable and high-efficiency filters to provide you a y and comfortable air environment. 4.[]Our upgraded LV-H128 filter is made of high-quality non-woven fabric and activated carbon, adopts advanced low energy consumption and low density structure technology, and has lower wind resistance, thus ensuring the highest filtration efficiency and the lowest energy consumption, while extending the life of the LV-H128 air purifier life. All the materials used for the LV-H128 filters are environmentally friendly and will not have any pollution to the environment. And they are also with excellent workmanship.