962Gas Space Between Panes

Most multiple-paned windows are filled with dry air. The thermal performance can be improved by the substitution of gases with lower thermal conductivities. Other gases and gas mixtures used besides dry air are Argon, Krypton, Carbon Dioxide, and Sulfur Hexafluo-ride. The use of Argon instead of dry air can improve the "center-of-glass" U-factor by 6-9%, depending on the dis-

Figure 9.21 Window components.

tance between panes, and CO2 filled units achieve similar performance to Argon gas. For spaces up to 0.5 inches, the mixture of Argon and SF6 gas can produce the same performance as Argon, and Krypton can provide superior performance to that of Argon.

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