Sign up or Login menu lookup shut lookup close lookup Your latest searches shut record Argon, xenon, or krypton are the most common sorts of gases useful for double glazed windows. These gases are nontoxic and apparent, so You can't see them amongst the window panes. Secondary double glazing https://trentonxunif.ampblogs.com/indicators-on-secondary-glazing-windows-you-should-know-71295775