Door panels shall be of similar construction to wall panels. Doors are 18"-36" wide and 72" high, or as specified on the drawings. Doors are the same thickness as the wall panel (either 2" or 4") thick with double overlapping air/acoustic seals around the sill, jambs and header. Each door has two heavy duty hinges and two latches with inside release handles. Hinges are heavy duty ball bearing type designed for door size and weight. Latches are wedge lever type with inside handle. Doors are installed to open against air pressure. Windows are furnished for doors where required, and consist of a thermal break, double-pane tempered glass, sealed acoustically and air tight with rubber seals. Windows are mounted in a metal frame to eliminate air leaks.