Functional requirements of a door?

1. The door must be able to open and close easily.
2. The door must provide security and privacy when closed.
3. The door must be able to lock securely.
4. The door must be able to withstand external forces such as wind and pressure.
5. The door must be able to provide insulation against noise, temperature, and weather.
6. The door must be durable and long-lasting.
7. The door must be easy to maintain and clean.
8. The door must comply with building codes and regulations.
9. The door must be accessible to people with disabilities, such as being wide enough for wheelchair access.
10. The door must have appropriate hardware, such as hinges, handles, and locks, to function properly.