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Table 9 Transmission Factors for External Miniature Louvres

 
Vertical Shadow
Angle (°)
Transmisson
 
Standard Koolshade
Low-Sun Angle KoolShade
0
0.65
0.5
15
0.4
0.2
30
0.2
0
45
0
0
60
0
0
75
0
0
90
0
0
 
From Colt KoolShade leaflet.