Windoorstech Vertical Slider Windows, a traditional fenestration concept that has become the perfect solution for ancillary frames when the opening aperture is taller than width i.e. reference golden ratio 1: 1.618, and when one opening sash is required for ventilation and/or fire escape! Its simple operation is based on a pair of frame specific, site tensioned, spiral balances that can hold the sash open in any position. The spiral balance technology has successfully replaced the traditional weights and pulley method because of requiring less space enabling the modern uPVC vertical slider to fit perfectly into both aperture types, straight through or reveal.

• Contemporary modern soft line appearance.
• 10 mm sash overlap for enhanced performance.
• Internal glazing options from 4 mm single to 22 mm double glass unit.
• Integrated handle bead for ease of operation
• Special spiral balances made to suit sash weight and frame size
• Opening sash secured with espagnolette locking device