I got an e-mail the other day from a Mr. J.E. Swain, and he asked two questions:1. "Why is the double-glazing industry producing 20-millimeter space partially filled argon gas units? Considering argon gas optimum gap between glass panes is 14 mm with a maximum of 16 mm, any wider, the gas reduces the efficiency and durability by approximately 35 percent, and why partially filled instead of full
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