Self-adhesive filter makes installation a snap, just like a sticker. Can be freely cut to fit your bathroom dryer size. Made of non-woven fabric that is mildew resistant & antibacterial Comes with a replacement reminder sign that pops out when the filter gets dirty. (Depending on the device or the device used, the product may not come out. Can also be used as a ventilation fan in the toilet or dressing room. Do not install on air vents. Always keep the fan in the bathroom dryer while installing the product. Do not use mist sauna with filter installed. Do not use with kitchen ventilation fans or range hoods. Depending on the size and shape of the bathroom dryer, the product may not be able to be installed Please read the package description carefully before using. When attaching to a rectangular toilet, dressing room, or bathroom ventilation fan, it cannot be attached to a model embossed on the surface. If you receive a replacement announcement sign, please replace it as soon as possible. If used while dirty, it may clog the filter and reduce the ventilation capacity. If the replacement announcement filter does not work well, please replace it in 1-2 months. There may be rare cases where the filter is removed. If this happens, wipe with mild detergent. When disposing as garbage, please follow the segment of your municipality. Do not use for anything other than intended purpose.