The first automatic sliding door was invented in 1954 by Lew Hewitt and Dee Horton and was installed in 1960 for use by people. A sliding door is a type of door drawn across an aperture. It opens and closes in a flat line, horizontally by sliding, usually parallel to a wall. Sliding doors move

Polyvinyl chloride (/ˌpɒlivaɪnəl ˈklɔːraɪd/;[5] colloquial: polyvinyl, vinyl[6]; abbreviated: PVC) is the world's third-most widely produced the synthetic plastic polymer, after polyethylene and polypropylene.[7] About 40 million tonnes are produced per year. PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible. The rigid form of PVC is used in construction for pipe and in profile applications such as doors and windows. It

Insulating glass (IG), more commonly known as double glazing (or double-pane, and increasingly triple glazing/pane), consists of two or three glass window panes separated by a vacuum or gas filled space to reduce heat transfer across a part of the building envelope. Insulating glass units (IGUs) are manufactured with glass in range of thickness from