Aluminum shop fronts are the ‘face’ of any building. This is the first contact for any potential customer. Aluminum shopfronts are manufactured from strong metal and toughened glass, thus providing light, space and a high level of security. Aluminum comes in light weight construction which makes it durable in demand. The use of aluminum allows you to get creative with your shop front designs. These doors can keep your shop safe from unwanted visitors. They form a gap between the bottom of the window and the side wall.
Source: https://www.unitedshutters.co.uk/london/aluminium-shopfronts/