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Double Glazing Unit Repair Double glazing that is hazy or cloudy, or that is not able to be cleaned has probably been "blown". This occurs when the gap between the window panes is widened due to the degrading of the window seals. It is a lot less expensive to replace the double-glazed unit than gasket seals. Seals The window seal (also called the gasket for windows) is responsible for sealing the air between the two panes in your double glazing. This prevents cold drafts from entering your home as well as p