window gas fill
Manufacturers have introduced the use of argon and krypton gas fills, with measurable improvement in thermal performance. These gases are inert, i.e don't react with other substances, and have a higher resistance to heat flow than air, so that they decrease a window's U-value. Argon is inexpensive, nontoxic, nonreactive, clear, and odorless. The optimal spacing for an argon-filled unit is the same as for air, about 1/2 inch (11-13 mm). Krypton has better thermal performance, but is more expensive to produce. Krypton is particularly useful when the space between glazings must be thinner than normally desired, for example, 1/4 inch (6 mm). The optimum gap width for krypton is 3/8" (9 mm). A mixture of krypton and argon gases is also used as a compromise between thermal performance and cost.
Related category• WINDOWS TOPICS
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