UPVC Sash Windows have one or two vertical, gliding sashes which operate by sliding one sash vertically past another. Tilt-out upper and lower sashes makes cleaning and inspecting weatherproofing strips simple and convenient. The standard unit has a UPVC frame, window latch, snap on insect screen, spring balance hinge and a single, glazed, grey anti-sun glass. These popular and traditionally styled windows offer medium to high ventilation, and the multiple chambers within the frame create a thermal barrier to reduces air loss and heat transfer. They are ideal for high traffic areas such as adjoining walkways, porches and patios.