Great value for money: Each package comes with a 200cm x 100cm filter cotton and 300cm of double-sided non-marking mounting tape. It can cover more than 36 standard exhaust ports. Covers non-standard larger size exhaust ports inexpensively Flexible DIY Design: Compatible with all sizes of vents, vents and grills. Cut to fit any size vent. This versatile design makes it easy to cover or install behind non-standard vent sizes and use in DIY projects EASY TO USE: Just stick the mounting strip to the outside of the vent and stick it on. Easily replace dirty filters without removing the vents. Easy to apply and replace without restricting This product is an air conditioner filter papers net cleaning anti-dust for dust allergens High-quality ventilation filter: Made of electrostatic non-woven polyester fabric. Special electrostatic filtration captures small particles and reduces dust in your home. They also prevent unwanted items from entering your home