A new variation on the highly successful range of Atlas Heavy Duty hinges has been developed to provide greater clearance of the window sash from the frame in the initial opening operation. This is ideal on window styles with small gaps between frame and sash, such as flush windows. Also available is an 18mm stack height hinge designed specifically for systems where the friction hinge arm needs to be raised to clear profile features. This 18mm hinge has the opening geometry of the Atlas flush hinge. Both variants are available in a 14″ side hung Egress Easy Clean, with a maximum sash size of 900mm and a maximum sash weight of 45kg.