Range hood 28 U.S. gauge, with minimum 2 in. (51 mm) vertical sides and provided with a bead or flange around top of hood to provide a minimum 1⁄4 in. (6 mm) dead air space between hood and protected material. Hood shall be not less than the width of the range and shall cover the entire bottom of the material to be protected extending over the top of range.
(The cooktop is the hinged or removable surface, excluding side trim used for mounting.)