Krishi Windowscape 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.