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Where can I find the serial number on my window?

On vertical or horizontal slider windows, tilt in, or lift out, the bottom or inside sash respectively and inspect the sash frame for a barcode label. The serial number is located in the top left corner of the label and may appear as a four, five or six character number followed by a hyphen and one or two digits. For example, 1234-5, 12345-6, W123456-78. These numbers represent the window order number and the line number on which the particular window details are listed within the order. This information is permanently archived in our information management system and will be retrievable for future reference to assist in facilitating any future window service.