Sales increase due to the “open door effect”. It is known that when doors are open, people affluence increases substantially Doors open is an invitation for customers Doorway acts as a shop window and allows people to see the inside of the shop Free access for disabled people (wheelchair) or people using baby strollers, trolleys, umbrellas, etc. Help to control uncomfortable sensations of draughts Increases available usable space on entrances Increases customers and staff comfort