OSU wooden windows (twin windows with draught strips) are the universal windows, with a frame size 92×55 mm, which are produced on the basis of twin design. External sash (49×42 mm) and internal sash (70×42 mm) of window unit are coupled. Separate internal hinges are used for fastening to the window frame. The screw coupling of sashes into one window unit allows to open them simultaneously. The access to the inner part of the window is provided by the design feature of the screw connection: if necessary, it can be untwisted. The use of common self-tapping screws for coupling the sashes is the cause of their untwisting, as the wood material begins to splay. The screw joint, which we use, is more practical — the sashes can be repeatedly twisted and untwisted, because the screw does not twist into the wood, but into the metal strip, located between the sashes. Along the contour of the sash there is a draught strip (heat insulation). The design of the window also provides for installation of a second draught strip. Prefabricated construction of the window sashes allows to perform a reliable sealing of the internal space, using silicone or sealant strip in the process of glazing. The thickness of glass in the external and internal sashes is 4 mm. Two variants of glazing are available:

• glass + glass: heat-transfer coefficient is 0.42-0.43 m2 °C/W;
• glass + double-glazed unit: heat-transfer coefficient is 0.55-0.57 m2 °C/W.

OSU wooden windows: the price for 1 m2 — 1840 rubles.

OSU wooden windows: the price for 1 m2 — 1790 rubles.

OSU wooden windows: the price for 1 m2 — 1790 rubles.

OSU wooden windows: the price for 1 m2 — 1790 rubles.

OSU wooden windows: the price for 1 m2 — 1790 rubles.