Automatic door Verandas Powered eight- panel round patio door with six simultaneously sliding central panels and two fixed lateral panels providing an opening spanning almost 20 feet. Constructed in glossy polished AISI 316 stainless steel, the two lateral panels are in white varnished alloy and the 6 mobile panels are glazed with 25.5 mm grey stratified glass . The door is ABS certified watertight and designed for internal installation. The doors are operated by an external push button and electronic key controlled by a multifunction microprocessor and are supplied with a telediagnostics control panel, emergency battery backup power, an internal standard push-button panel with status indicator leds and a manual safety release in the event of a power failure. Automatic safe-closing features open the doors if they contact any resistance to closing.