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Available Light Zones


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% Roof Coverage for
50% of Annual 8 a.m. to 5 p.m.
Hours Daylighted at Design Footcandles

Light Zone

10fc

30fc

60fc

120fc

12

2.40

5.3

8.6

18.0

22

1.20

3.6

6.9

15.0

32

1.00

2.5

4.3

9.8

4

0.45

1.6

3.5

7.7

5

0.42

1.3

3.0

6.4
2 Double Glazing recommended in these zones.


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