Most commonly used in military hangars are slide doors of the anchored and floating group, and individually motor-operated types. However, the exacting requirements for the ever increasing number of different aircraft dictate the use of aperture doors. Fleming has designed many types of aperture doors - some with stationary panels, others are vertically, horizontally, and diagonally adjustable independent of the host door leaf, either manually or by motor. Aperture panels can easily be changed if new aircraft are assigned to the hangar.