An apparatus positionable within the chassis of an off-highway machine, the apparatus comprising: a prime mover ; a cooling package ; a cooling fan located between the prime mover and the cooling package ; and a shroud , the shroud comprising: an inlet having a first side , a second side , a third side , and a fourth side , the inlet configured to house the cooling package ; an outlet , the outlet configured to house the cooling fan ; and an elliptical lip section positioned at the outlet , the elliptical lip section including a first planar face and a second planar face facing away from the first planar face , the second planar face having a centroid, wherein a plane coincident with the second planar face includes a first axis parallel to the second and fourth sides of the inlet and a second axis perpendicular to the first axis, both the first axis and the second axis passing through the centroid, wherein the first and second axes together divide the elliptical lip section into four quadrants, and a plurality of apertures extending through the elliptical lip section configured to direct air subjected to a blockage cause by the prime mover away from the cooling fan , at least one aperture of the plurality of apertures positioned in each quadrant of the four quadrants of the elliptical lip section . a prime mover ; a cooling package ; a cooling fan located between the prime mover and the cooling package ; and a shroud , the shroud comprising: an inlet having a first side , a second side , a third side , and a fourth side , the inlet configured to house the cooling package ; an outlet , the outlet configured to house the cooling fan ; and an elliptical lip section positioned at the outlet , the elliptical lip section including a first planar face and a second planar face facing away from the first planar face , the second planar face having a centroid, wherein a plane coincident with the second planar face includes a first axis parallel to the second and fourth sides of the inlet and a second axis perpendicular to the first axis, both the first axis and the second axis passing through the centroid, wherein the first and second axes together divide the elliptical lip section into four quadrants, and a plurality of apertures extending through the elliptical lip section configured to direct air subjected to a blockage cause by the prime mover away from the cooling fan , at least one aperture of the plurality of apertures positioned in each quadrant of the four quadrants of the elliptical lip section . an inlet having a first side , a second side , a third side , and a fourth side , the inlet configured to house the cooling package ; an outlet , the outlet configured to house the cooling fan ; and an elliptical lip section positioned at the outlet , the elliptical lip section including a first planar face and a second planar face facing away from the first planar face , the second planar face having a centroid, wherein a plane coincident with the second planar face includes a first axis parallel to the second and fourth sides of the inlet and a second axis perpendicular to the first axis, both the first axis and the second axis passing through the centroid, wherein the first and second axes together divide the elliptical lip section into four quadrants, and a plurality of apertures extending through the elliptical lip section configured to direct air subjected to a blockage cause by the prime mover away from the cooling fan , at least one aperture of the plurality of apertures positioned in each quadrant of the four quadrants of the elliptical lip section . <EOS>