Black Millwork has introduced a "high performance" Urban Sliding Sash window to its extensive collection of timber windows and doors.<br> <br> Combining the classic lines of a Victorian era window with the technical benefits of a modern product, this solution is ideal for both period refurbishments and elegant new build properties, Black Millwork says.<br> <br> The windows are available in double or triple glazed formats to offer maximum thermal performance, as required. Black Millwork says that the units deliver excellent energy efficiency, achieving a Uvalue of 1.5 for the double glazed option and 1.3 for the tripled glazed choice.<br> <br> Advances in manufacturing techniques mean that the windows are available with a narrow profile frame – enabling more light to filter into the property. Black Millwork says that it is currently the only manufacturer able to offer a triple glazed sliding sash in a narrow frame.<br> <br> <a href="http://www.blackmillwork.co.uk">www.blackmillwork.co.uk</a>