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Double Glazed Window Installation Double glazing can make a big difference to your home, offering thermal insulation as well as noise reduction and security. However, installing double-glazed windows isn't an easy task to do. Invest in a FENSA-approved installer to profit from your investment. The installer will begin by building the frames, brickwork and the new windows. Frame The frame of a double glazed window is usually made of uPVC or timber, or aluminum. It is a frame that holds the glas