Door hangers are easy-to-notice prints commonly placed in home or office door knobs. They’re commonly seen on hotels as do-not-disturb and room-cleanup signs. Door hangers can also be used for marketing purposes, and are ideal for restaurant owners, home service businesses and real-estate. You can use business door hangers as a visual representation of your brand, products and services by including your brand, contact info, office schedules and special promos.