Milgard's AX450 Moving Glass Wall features an aluminum frame with wide openings that stack or slide into pockets, eliminating barriers between indoors and out. Despite its large panel sizes, the AX450 glides seamlessly on a track for easy operation due to sealed stainless steel ball-bearing rollers. A warm-edge spacer system and thermally improved aluminum frame provide energy efficiency, with optional upgrades like Low-E glass and gas between the panes to help reduce energy bills. The product is also AAMA- and NFRC-tested and certified.