Patent ID: 8100164

Claim:
A movable partition system, comprising: a movable partition; a track assembly with which the movable partition is engaged and horizontally along which the movable partition is extendable, comprising: a track for guiding movement of the movable partition along the track assembly; and a shroud at least partially surrounding the track, the shroud and track being sized and shaped to define a gap between the track and the shroud; an intumescent material interposed between the track and the shroud in the gap between the track and the shroud; and a lead post attached to a distal end of the movable partition, comprising: a leading distal end; a cap at least partially surrounding the leading distal end, the cap and the leading distal end being sized and shaped to define a gap between the cap and the leading distal end; and an intumescent material interposed between the leading distal end and the cap within the gap between the cap and the leading distal end.