Pine, Mahogany, Dark Red Meranti or Oak adds not only to the beauty of your home, but dramatically reduces the heat losses. The double glazed insulation panels could lower the noise load up to 45dB. The k-value for normal insilated glass is 2,5 ...1,8 W/gmK but could reach with low emissivity glass and Argon filling the value of 1,1 W/gmK, so the overall insulation of the window 1,2 W/gmK. The windows are engineered to fit any buiding construction method with the concealed fasteners provided. The single handle tilt and turrn hardware is fitted with an additional security device in order to avoid unwanted injury by improper operation. For added security we provide also special protective foils and hardware applications, which makes it difficult to penetrate into your house through the window, even if it is tilt-open for ventilation. Please do not hesitate to ask for details. User information for single tilt and turn windows and doors: