What is the best air gap for double glazing?

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Tags

1. #glazing
2. #provides
3. #provide
4. #sound
5. #optimum
6. #having
7. #100mm
8. #simple
9. #passing
10. #existing
11. #additional
12. #preventing
13. #windows
14. #glass
15. #secondary
16. #performance
17. #barrier
18. #effective
19. #between
20. #through
21. #200mm