The Multi-Panel Gliding Patio Door can be customized with two-, three- or four-panel configurations up to 8 feet high and 16 feet wide. The saddle-style doors glide on a reinforced vinyl rail and heavy-duty, adjustable stainless steel rollers. They also feature a mechanical frame and welded sash, dual-seal weatherstripping, reinforced vinyl hollows and an internal weep system. The doors carry a DP-50 class performance rating and can be specified with impact-rated glass. Low-E insulated glass and dual low-E insulated glass bring the doors’ R-value to 3.33 and 4.35, respectively. White and beige are standard and commercial bronze and black exterior finishes are available.