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Double-Glazed - See Dual-Glazed.
Double-Hung Window - Two sashes, top and bottom, that slide vertically past each other, joined by a meeting rail and held in any open position by means of weights or one of several types of balancing devices.
UPVC - A type of stable plastic used in the manufacture of double-glazed window frames, doors and cladding.
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 See also: System, Standard, Profile, Pane, House
  
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