The 20 x 25 x2 Restaurant Style Baffle Grease Filter is made from a unique roll formed baffle, designed to prevent flame from penetrating through the filter into the duct work. Two layers of equally spaced baffles create an air flow which gives unsurpassed performance in efficient grease removal. Smooth baffle surfaces cause a continuous run-off, allowing grease to be safely deposited in collection troughs. Classified by Underwriters Laboratory Inc. as to flammability only after exposed to grease-laden air. Designed to be used in grease hoods and fryers. The Restaurant Style Baffle Grease Filter is available in Stainless Steel. The Stainless Steel Grease Filter is rated to 900 degrees F. When ordering your filters, note that the Vertical dimension is listed first. Please note that all sizes are 1/2″ less than stated. So a filter listed as 10X16X2 is actually 9 1/2″ x 15 1/2″ x 1 7/8″.