The Alsysco Knysna, Valencia and Villa products are available as both sliding windows and doors, however, the Grecian is available only as a sliding window. They accommodate glazing from 4mm to 25mm from single to double-glazing glass depending on the product chosen. The excellent sealing protects against water and air infiltration. A hollow sump sill is available for improved water drainage and includes an anodised replacement track for easy maintenance. Smooth and light sliding action is what all our sliding windows and doors are known for. Reinforced interlockers allow for improved wind-load performance. Fixed or multi sliding sash options are available in double and triple track configurations. All weather seals and accessories are on the sashes for easy repair or replacement. Double axle rollers are available for large or heavier sashes. Reliable and secure locking mechanisms give you peace of mind. Our manufacturing tools and jigs ensure production and installation accuracy for a seamless transition from the show room to your home. All Alsysco sliding windows and doors comply with stringent AAAMSA design standards.