How are fire doors constructed?

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Tags

1. #sometimes
2. #beyond
3. #expand
4. #timber
5. #between
6. #designed
7. #intumescent
8. #usually
9. #again
10. #doors
11. #solid
12. #temperatures
13. #features
14. #reach
15. #edges
16. #around
17. #glass
18. #itself
19. #covered
20. #frame
21. #which
22. #resistant