at acceptable levels a screen 14 is placed on top of the applique grille 13 to prevent the ingestion of debris fig2 is a cross sectional view of the grille 12 applique grille 13 and the screen 14 in the preferred embodiment the screen is a wire fabric made of low carbon galvanized steel wire the wire has a 0 035 inch 0 889 mm diameter and forms a 7 u00d7 7 mesh which has 7 squares by seven squares per square inch in the preferred embodiment the grille 12 is formed by a plurality of parallel s shaped louvers 17 the s shaped louvers 17 are aluminum the s shaped louvers 17 have various lengths determined by the shape of the grille 12 the s shaped louvers 17 have a width 18 of 5 inches 127 mm the s shaped louvers overlap defined in that when s shaped louvers overlap there is no straight path in the direction of the widths of a s shaped louver and within the grille that does not encounter an s shaped louver the s shaped louvers 17 are spaced apart center to center 1 250 inches 31 75 mm the louvers have a thickness 33 of 0 625 inches 15 875 mm they are spaced with a spacing 34 of 0 625 inches apart 15 875 mm the applique grille 13 is formed by a plurality of metal bars 20 the metal bars 20 are straight and parallel to each other the metal bars 20 are also parallel to the s shaped louvers 17 the metal bars 20 have various lengths determined by the shape of the applique grill 13 in the preferred embodiment the metal.