Internorm has added to its Home Pure range of windows with the new KF500 system.<br><br>The company says that the new KF500 system boasts a thermal insulation value of up to 0.69 W/m2K and provides optimum energy efficiency. Equipped with Internorm’s I-tec locking which is fully integrated into the sash, the system has no visible locking parts in the window frame making it ideal for cleaning and maintenance, Internorm claims.<br><br>Visually, the KF500 has 30% less view height from the frame and sash (80mm). The finished result is one where the KF500 incorporates a high glass proportion for maximum light with no visible bead inside the frame. Internorm says that the KF500 is the only window system in the UK to feature the optional extra of Internorm’s I-tec ventilation, an integrated mechanical ventilation heat recovery system, which reportedly achieves 86% energy efficiency. <br><br><a href="http://www.internorm.co.uk">www.internorm.co.uk</a>