Round grate rings on the edge of the opening provide stability to the wok. Rupert placed a hanging iron door between the fire grate and the chimney. The chimney has large holes around its circumference below the grate. The bottom of the box was made of a steel grate. Beneath each tier of bunks were individual lockers with a wooden grate floor. A mechanical grate withdraws the lime at the bottom. Ash falls through the grate into an ashpan. A modified A4 boiler was fitted which had of grate area and diameter cylinders. Leela then saves Fry by dumping the super-slurm down a drainage grate. This air flow also has the purpose of cooling the grate itself. The National Park Service has sealed the entrance with a steel grate for public safety. She is attached to a large metal grate illuminated by "hot pink neon" light. In tropical countries graters are also used to grate coconut meat. The suspended metal grate is often referred to as a gridiron. He then reaches a ladder and climbs it, pushing through a grate.