The Arca plastic enclosures from Fibox are available from stock with a viewing door. The seamlessly fitted window is made of polycarbonate, as is the enclosure body. The enclosures permanently withstand temperatures from -40 to +80 °C (briefly up to +120 °C). They are impact-resistant up to IK08 and comply with protection class IP65 for indoor and outdoor applications. According to the manufacturer, the corrosion-resistant enclosures weigh around 50 % less than sheet steel enclosures of the same size. They can be customized. Optional inspection doors are available for all 14 sizes from 200 mm x 300 mm x 150 mm to 800 mm x 600 mm x 300 mm. The hinges are fitted either on the short or long side. They are locked with a 2-point locking system using a double-bit lock or swivel lever.