4100 Series Acoustical Accordion Doors Panels: 6” or 8" wide by ½" thick medium density fiberboard with routed edge for vinyl hinging. Hinge assembly: 16 gauge steel, pantograph action for dualwall door assembly. Panel Connectors: Flexible vinyl, color-coordinated to panel selection, inserted and attached into routed edges. Track: 2” x 1-1/4” aluminum, pre-punched for screw fasteners for surface mounting. Sound Seal: Dual-wall door with internal acoustic material, flexible vinyl sweep strips…