Preferred Engineering – ENGINEERING TOOLS AND SERVICES Parallex, Tilt N Slide, Slide N Hide, Window, Window hardware, Hardware, Fenestration, Windows, Window hardware manufacturer, Window systems, Window operating systems, Fenestration systems, Window manufacturer, Window manufacturer Canada, Window manufacturer USA, Canadian window manufacturer, US window manufacturer, American window manufacturer, Casement, Casement window, Double-hung, Double-hung window, Double hung window, Single-hung, Single-hung window, Single hung window, Slider, Slider window, Tilt-in, Tilt-in slider,Tilt-in slider window,Window drainage systems,Weepers,Window weepers,Sash,Window sash,Frame,Window frame,Extrusion,Extruder,Window frame extrusion,Frame extrusion,Door frame extruder,Self-storing screen,Self-storing window screen,Add-on screens,Add-on window screen,Aftermarket screens,Aftermarket window screens,Truth hardware,G-U hardware,Blaine hardware,Engineering,Preferred engineering products,Preferred Preferred Engineering Products was founded in 1988 to fill a void in the specialized window hardware market. Through extensive research and constant customer consultation, …