U-Trim Grease and Odor Extraction Filter * 15x18x11/32 U-Trim Filter * This filter comes with one layer of carbon polysorb between two layers of expanded aluminum for support, four plastic metal frames and four metal corner clips. * This Cut-To-Fit filter allows you to replace almost any carbon range hood filter with a 3/8" thickness. Removes odor from the air. Just follow the detailed instructions on the back of the package and create your own filter in minutes! * DO NOT WASH, because the carbon material used in this filter will deteriorate. Replace approximately every six months.