Made with metal that effectively captures grease particles, cooking odors, and airbornes impurities Provides double stage air purification to maintain freshness kitchen air without odors dispersion This S99010308 replacement filter set is designed specifically for ductless ranges hoods, suitable for BPSF30, and WS130AA / WS130BC Measuring 10.83 " x13.39 ", it precisely matching OEM specifications as a rear mounted secondary filter Features clip on mounting design that requires not tools or technical skills Easily attaches to the aluminum grease filter bracket as a secondary filter just aligns and into place for immediate use Built with premium materials to withstand high temperature kitchen environments Resistant to deformation and damage, ensuring stable filtration over extended periods The 2 pack set lasting replacement value Includes two to ensures continuous availabilities when replacements are needed These not washable should be replaced every 6 9 months for optimal ranges hood