Abundant Dock High Overhead Doors with Hydraulic Dock Levelers. Clear Height: 20 ft to 37 ft, 7 in. Roof Vents for Enhanced Air Circulation. Fire Suppression: Wet System. Multiple Skylights to Provide Natural Lighting. 29 Automatic Overhead Dock-High Doors - Hydraulic Dock Levelers. 4 Automatic Over-Sized Grade-Level Doors.