|
Natural Spaces Skylight Performance Data (glass portion only – in vertical position)
|
|
Glass type & color
|
% Daylight
Transmitted
|
U-Value
Winter
|
R-Value
Center of Glass
|
Relative Heat
Gain BTU/hr/sf
|
% UV
Blocked
|
|
Clear double pane
|
81%
|
0.48
|
2.04
|
182
|
36%
|
|
Bronze tint dbl pane
|
53%
|
0.48
|
2.04
|
135
|
68%
|
|
Grey tint dbl pane
|
45%
|
0.48
|
2.04
|
131
|
62%
|
|
Solarcool (mirror)grey,dbl #2
|
16%
|
0.48
|
2.08
|
85
|
93%
|
|
|
|
|
|
|
|
|
Clear dbl pane Low-E #3
|
73%
|
0.34
|
2.86
|
167
|
50%
|
|
Bronze tint dbl pane Low-E #3
|
44%
|
0.34
|
2.86
|
115
|
77%
|
|
Grey tint dbl pane Low-E #3
|
37%
|
0.34
|
2.86
|
111
|
73%
|
|
Solarcool (mirror) gry, dbl, Low-E #3
|
14%
|
0.34
|
2.94
|
63
|
96%
|
|
|
|
|
|
|
|
|
Clear dbl pane Low-E #3 Argon
|
73%
|
0.29
|
3.33
|
167
|
50%
|
|
Bronze tint dbl pane Low-E #3 Argon
|
44%
|
0.29
|
3.33
|
115
|
77%
|
|
Grey tint dbl pane Low-E #3 Argon
|
37%
|
0.29
|
3.33
|
111
|
73%
|
|
Solarcool (mirror) gry, dbl, Low-E #3 Argon
|
14%
|
0.29
|
3.33
|
63
|
96%
|
|
|
|
|
|
|
|
|
Clear dbl, 2 layers, Low-E, Argon
|
|
0.27
|
3.70
|
|
|
|
|
|
|
|
|
|
|
Clear triple pane
|
65%
|
0.29
|
3.45
|
145
|
|
|
Bronze tint triple pane
|
37%
|
0.29
|
3.45
|
96
|
|
|
Grey tint triple pane
|
29%
|
0.29
|
3.45
|
92
|
|
|
Solarcool mirror triple pane #2
|
12%
|
0.27
|
3.70
|
59
|
|
|
|
|
|
|
|
|
|
Clear triple, Low-E #5 Argon
|
57%
|
0.21
|
4.76
|
99
|
|
|
Bronze, triple, Low-E #5 Argon
|
32%
|
0.21
|
4.76
|
67
|
|
|
Grey, triple, Low-E #5 Argon
|
27%
|
0.21
|
4.76
|
63
|
|
|
Clear, triple, 2 Low-E Argon
|
|
0.16
|
6.25
|
|
|
|
|
|
|
|
|
|
|
Marvin Windows Performance Data (Casement) Based on LoE3-366 glass with argon gas
|
|
Glass type & color
|
% Visable Light
Transmitted
|
U-Value
(total unit)
|
R-Value
(total unit)
|
Solar Heat
Gain Coefficient
|
|
|
Clear dbl, Low-E 366, Argon 3/4″ (Intergrity)
|
46%
|
0.28
|
3.57
|
.20
|
|
|
Triple, High-R, Low-E 272, Argon 1″ (Ultimate)
|
39%
|
0.23
|
4.30
|
.24
|
|
|
|
|
|
|
|
|
|
VELUX Roof Windows and Skylight Performance Data (based on 2010 models using LoE3-366 glass)
|
|
Glass type & color
|
% Visable Light
Transmitted
|
U-Value
(total unit)
|
R-Value
(total unit)
|
Solar Heat
Gain Coefficient
|
% UV
Blocked
|
|
VSEand VS Units: Clear dbl, Low-E 3, Argon
|
|
|
|
|
|
|
Tempered over tempered glass (05)
|
54%
|
0.43
|
2.33
|
.23
|
95.2%
|
|
Tempered over laminated glass (04)
|
53%
|
0.42
|
2.50
|
.23
|
99.9%
|
|
|
|
|
|
|
|
|
FS Units: Clear dbl, Low-E 2, Argon
|
|
|
|
|
|
|
Tempered over tempered glass (05)
|
61%
|
0.45
|
2.70
|
.26
|
95.2%
|
|
Tempered over laminated glass (04)
|
60%
|
0.44
|
2.60
|
.26
|
99.9%
|
