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Double Glazing Unit Repair If you have double-glazed windows that appears misty or cloudy and can't be wiped clean it's likely to have been "blown". This happens when the seals on windows become weaker and the gap between the panes of glass expands. It is a lot less expensive to replace the double-glazed unit than the gasket seals. Seals The window seal, often called the window gasket is responsible for sealing air in between the two panes of glass in your double-glazed. This will stop cold drafts from en