Series 88 Vinyl Patio Doors FEATURES Fusion-welded corners on the mainframe and panels add strength and ensure a weather-tight seal. Pre-assembled, field-reversible unit eliminates rite need for order/inventory of handed units. 7/8" tempered insulated glass is standard, providing maximum thermal efficiency. Moving panel is equipped with sturdy adjustable tandem rollers for making easy field adjustments. Multi-chambered frame with .065" wall thickness increases thermal performance and structural strength. In addition to overall AAMA product certification, the PVC material we use meets stringent AAMA forced entry requirements. Lock and meeting rails feature metal reinforcement for superior structural integrity. 4-1/2" mainframe features a 1-1/4" nail fin offset that's ideal for brick applications. Durable screen design with adjustable rollers. OPTIONS Low-E glass available in "High Performance” that delivers maximum thermal and solar heat gain performance or “Standard” Low-E for increased thermal performance at a more economical price. Bronze or gray tint, obscured and all glass options listed are available in tempered. White or tan frames with matching hardware. 3/4" internal grids. Matching sidelights for 3 and 4 lite configurations. Accessories for extension jambs, J-trim/siding return, dry wall return and more available.