Apertures are used in military hangars, commercial aviation hangars, and special application facilities. The Aperture Systems are typically mounted in slide doors of the Anchored Group Biparting and Individually Motor Operated door systems. The exacting requirements for the ever-increasing number of different aircraft or ships 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 motorized or manual. Aperture panels can easily be changed if new air or sea craft are assigned to the facility.