Why is it called a curtain wall?

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Tags

1. #costs
2. #system
3. #construction
4. #covering
5. #building
6. #walls
7. #which
8. #utilized
9. #weather
10. #since
11. #curtain
12. #outer
13. #lightweight
14. #materials
15. #reducing
16. #thereby
17. #structural
18. #occupants