The new Inovo Patio Door by Simonton is offered in two-, three-, and four-panel styles and features a top-hung screen that minimizes contact with obstructions that can settle into the bottom track and interfere with opening and closing. The all-new patio door also features a welded sill with a neutral colored fiberglass overlay. It has a fully assembled frame, tilt-in operating panel and easy on/off screen for faster professional installation, monorail system for a tighter seal and smoother glide

Source: www.windowsforyourhome.com