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Hi. We aquired some 8 x 4 (feet) single glazed panels, 3 of which we have used in a 'sun room' extension. We have enough panels to create 'double glazing', but are wondering what would be the best wsy to go about it, bearing in mind that the existing panels are already fixed in place in timber frames. They are recessed within the frames, so there is room to add an extra panel.