Glass Performance Comparison Chart (effective
June 30, 2004)
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A
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D
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E
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F
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G
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H
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I
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L
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M
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N
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O
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P
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Q
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R
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Description
Construction
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Transmittance
(%)
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Reflectivity
(%)
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ASHRAE
Winter
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European
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Four Seasons' Standard Glass
CONSERVAGLASS SELECT™
Exclusive High Performance Insulated Safety Glass
Tempered safety glass which incorporates advanced exotic coating technology
with Argon gas filling and exterior glass cleaning and protection features.
Ensures superior performance and life expectancy for years of comfortable,
cost-effective year-round living.
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7E
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MC-7E / Argon / Clear
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65
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25
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5
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11
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12
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0.31
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0.27
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65
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0.25
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4.0
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1.13
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204
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78
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MC-16 / Argon / Clear
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16
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10
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7
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11
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25
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0.18
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0.15
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39
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0.25
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4.0
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1.20
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123
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78L
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MC-16 / Argon / Laminated
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15
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9
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1
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11
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24
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0.17
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0.15
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38
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0.24
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4.2
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1.21
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120
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9E
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MC-7E / Argon / Clear / Argon / MC-79
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57
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21
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2
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14
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17
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0.29
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0.25
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61
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0.20
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5.0
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1.19
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199
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9K
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MC-7E / Krypton / Clear / Krypton / MC-79
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57
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21
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2
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14
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17
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0.29
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0.25
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59
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0.14
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7.1
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0.80
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191
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97A
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MC-16 / Argon / Clear / Argon / MC-72
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13
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6
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2
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11
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19
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0.15
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0.13
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33
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0.20
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5.0
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1.16
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119
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97K
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MC-16 / Krypton / Clear / Krypton / MC-72
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13
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6
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2
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11
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19
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0.14
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0.12
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29
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0.13
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7.7
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0.76
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102
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Four Seasons' High Performance Single Glazing -- Sun Smart™
Four Seasons Seasonal Sunroom, our Series 200, uses a high performance single-glazed product under the trademark Sun Smart™ to improve the performance and effectively extend the seasonal use of your seasonal sunroom.
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7
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Green Single Glazing
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83
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60
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43
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8
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8
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0.81
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0.70
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158
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0.96
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1.04
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5.91
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The Competition's Standard Glass Single Glazing
Can only be used in unconditioned rooms designed for "part-time" use!
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1
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Clear Single Glazing
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90
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83
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73
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9
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9
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0.99
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0.85
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213
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1.10
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0.9
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5.60
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672
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2
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Bronze Single Glazing
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67
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64
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39
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7
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7
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0.84
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0.72
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183
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1.10
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0.9
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5.60
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577
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4
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Azurlite Single Glazing (Blue)
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77
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43
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36
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8
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8
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0.67
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0.57
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149
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1.10
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0.9
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5.60
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469
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7
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Green Single Glazing
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76
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48
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28
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7
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8
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0.71
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0.61
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158
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1.10
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0.9
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5.60
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498
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The Competition's Standard Glass Double Glazing
Does not allow for comfortable, cost-effective year-round living.
Better than Single Glazing but still not energy efficient.
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20
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Clear / Clear
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81
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69
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58
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16
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16
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0.88
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0.75
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183
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0.49
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2.0
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2.60
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576
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21
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Bronze / Clear
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61
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54
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33
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11
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14
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0.72
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0.62
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151
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0.49
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2.0
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2.60
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475
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23
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Azurlite / Clear (Blue)
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70
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37
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31
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13
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15
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0.54
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0.46
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115
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0.49
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2.0
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2.60
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361
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The Competition's Optional Glass High-Performance Double
Glazing
Offers comfortable year-round living but at a significant price increase and an
extended lead time.
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30
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Solar Cool Bronze / SG500
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22
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23
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8
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37
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24
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0.38
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0.32
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81
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0.35
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2.8
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1.90
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254
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Solar Cool Bronze / Argon / SB60VT
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21
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11
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3
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37
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17
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0.23
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0.20
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52
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0.34
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2.9
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1.80
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165
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Solar Bronze / HM-44 / Clear
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28
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14
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0
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30
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14
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0.24
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0.21
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53
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0.31
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3.2
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1.70
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167
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LoE2 / Argon / Clear
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72
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38
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16
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11
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12
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0.47
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0.41
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97
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0.26
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3.85
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1.40
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309
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NOTES BY COLUMN:
(C.) CODE 7E - can be used for roof in cold climates.
(E.) VISIBLE LIGHT (Glare) - The lower the better. A measure of that portion of
total solar radiation visible to the human eye. Note: the glare caused by too
much light can cause discomfort. Codes 74 and 78 have excellent glare control.
(G.) UV (Ultraviolet) - The lower the better. Accounts for about 50% of fabric
fading. Eliminating all UV reduces fading by 50%.
(H. & I.) REFLECTIVITY - Choose a low number in the vertical area for best
clarity and lowest reflectivity.
(L.) SHADING COEFFICIENT - The lower the better. Ratio of solar gain to 1/8"
clear glass.
(M.) SOLAR HEAT GAIN COEFFICIENT - The lower the better. Ratio of total solar
heat energy transmitted and absorbed by each layer of a glazing system.
(N.) RELATIVE HEAT GAIN - The lower the better. Amount of BTU's gained per hour
per square foot of glass.
(O.) U-VALUE - BTU/HR/SQ. FT./oF The lower the better (R=1/U).
(P.) R-VALUE - The higher the better.
(Q. & R.) EUROPEAN RATINGS - Similar to US (O & P) European
Environmental Conditions are Winter Temp Out=32F, Temp In=68F, Wind=7.8 mph,
Direct solar=0, T Sky=32F, Summer, Temp Out=89F, Temp In=68F, Wind=7.8 mph,
Direct Solar=248.2 Btu/h ft. sq, T Sky=89F.
Source: LAWRENCE BERKELY LAB
Windows 4.1 ALL values are center of glass for vertical glass. Calculations
based on 90% gas fill rate. All values are based on 1/8" lites of glass with
5/8" airspace (7/8" overall).
CONSERVAGLASS SELECTTM is a registered trademark of Four
Seasons Solar Products LLC.
The use of breather tubes for higher altitudes may negatively impact the
performance value documented in this chart.
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