Key benefits Enhanced airflow and cooling efficiency: reduces dust and debris buildup so your air conditioner can run more effectively and help keep indoor spaces comfortable, including during travel. Durable, long lasting construction: cotton filter pads in a 2pack designed for extended use with air conditioners, helping prevent premature wear and supporting sustained system operation. Easy tool installation: user friendly design that requires no special tools; simply insert the replacement filter sponge into your unit for quick maintenance. Flexible filtration options: choose from catechin element, standard filter cotton, or 3in1 health filter element (size 21*52mm) to meet different air purification needs for your cooling system. What you get 2 cotton filter pads designed for extended use with air conditioners Specifications Material: cotton Package: 2pack Optional filter types: catechin element, standard filter cotton, 3in1 health filter element 3in1 option size: 21*52mm How to install Turn off and unplug the air conditioner. Remove the existing filter from its slot. Insert the replacement sponge filter into the slot until it is securely seated. Reassemble the unit and power it back on. Use scenarios Home cooling: use in a bedroom or living room air conditioner to maintain clean airflow and steady comfort during hot weather. Travel and outdoor environments: suitable for travel in RVs or hotel rooms where air quality and system efficiency may be affected by dust and debris. Small office or enclosed spaces: adaptable filtration options allow you to tailor air purification to the specific environment and needs.