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Double Glazed Window Installation Double glazing can make a big impact on your home by providing insulation from heat, noise reduction and improved security. Double-glazing windows are not an easy task to do yourself. Make sure you choose a FENSA-approved contractor to reap the benefits of your investment. The installer will begin by making the frames, brickwork and the new windows. Frame The frame of a double-glazed window is typically made of uPVC or timber, or aluminum. It is a frame that holds the