AC AIR VENT COVER: Made of electrostatic non-woven premium polyester fabric. Special electrostatic media can capture small airborne particles, improving your hotel room environment. It also guards against undesirable elements from entering your space. PORTABLE: This travel AC Air Vent Cover is compact and lightweight. It can be packed in your carry-on or any other suitcases, making it ideal for use while on the go. BREATHE CLEANER AIR: Effectively capture most of airborne particles (MERV13 rating). This AC Air Vent Cover contributes to a cleaner breathing experience, allowing you to breathe with confidence and comfort. GOOD AIRFLOW: The Travel AC Air Vent Cover is made out of thin materials that do not hinder airflow. The low density media is effective and lightweight with no resistance to out-coming air. SURFACE PREPARATION: Nothing sticks to grease. To achieve better stickiness, the section of the AC air vent grille that will hold the filter should be cleaned of any grime and grease. Use the cleaning pads (included in package) to thoroughly wipe the surface of the AC vent frame and wait 5 minutes before you attach the filter. INSTALLATION: These Travel AC Air Vent Cover require minimal setup. Crafted for easy installation, enjoy the simplicity of a quick and hassle-free process. Before installing the cover, remove any red polypropylene lining and align it with the edges of the vent grille where the cover is meant to be installed. Apply gentle pressure to the cover's borders to make sure it adheres properly to its location (look at the video demonstration). Made of electrostatic non-woven premium polyester fabric. Special electrostatic media can capture small airborne particles, improving your hotel room environment. It also guards against undesirable elements from entering your space.