The Window Ware Aluminium Letter Box features a fully extruded aluminium frame set, with internal and external sprung flaps. It is 305mm wide and is designed to suit doors between 38mm and 78mm thick. The external flap has been designed to be opened approx. 147°, ensuring generous and clear access to the sleeve aperture and it comes complete with an internal nylon brush seal for reduced air filtration. Features The Alpha Letter Box has a fully extruded aluminium frame set with internal and external sprung flaps The external flap has been designed to be opened approx. 147º, giving a generous and clear access to the sleeve aperture A secondary internal nylon brush seal has been introduced to reduce air filtration when in use Will suit door thickness of 38 – 78mm
