Dock leveler is an adjustable mechanized platform built into the edge of a loading dock. The platform can be raised, lowered, or tilted to match the level of trucks to load and unload goods. Warehouse openings and of the docked vehicles result in gaps which have to be sealed in the best possible way. The vehicle reverses into the dock shelter which seals it off with flexible side and top curtains, giving weather protection during loading and unloading. A complete range is available to suit different types of vehicles. Inflatable Type dock shelter is recommended for temperature controlled warehouses. An overhead door consist of a door leaf that closes-off and opening in a building. This door leaf consists of horizontally connected panels and it is opened vertically.