Robust, thermally efficient PVC-U casement windows feature high quality triple glazing and strong, slim profiles. Outward opening. Durable and easy to maintain. Overall height includes the sill. Left-Hand Side-Hung & Top-Hung Opener Over Fixed Light 36mm Argon-Filled Insulating Glass 10 Year Manufacturer's Guarantee (T&Cs Apply) U-Value: 1.0W/m²K Trickle Ventilation 70mm Internally Beaded uPVC Profile Locking Mechanism uPVC Sill White Handle Left-Hand Side-Hung & Top-Hung Opener Over Fixed Light 36mm Argon-Filled Insulating Glass 10 Year Manufacturer's Guarantee (T&Cs Apply) U-Value: 1.0W/m²K Trickle Ventilation 70mm Internally Beaded uPVC Profile Locking Mechanism uPVC Sill White Handle