panoramah! AH! VERTICAL SLIDING Tempered glass sliding window

AH! VERTICAL SLIDING is a tempered glass sliding window.‎ This opening system operates by connecting two or more vertical sliding glass panes through an internal counterweight system.‎ Perfectly balanced the glass panes move effortlessly in opposite directions and are freed to cover large surface areas.‎ Further info from manufacturer on AH! VERTICAL SLIDING panoramah!