IV68 windows are constructed with a frame and sash made of multi-laminated wood and can be made in any shape or opening. The material options include Spruce, Pine, Meranti, and Oak. The windows offer acoustic insulation between 30-42dB and thermal transmittance values between 1.27-1.39 W/m2K depending on the size of the window. The standard glazing has a heat transfer coefficient of 1.1 W/m2K.