A mine stopping having a man door and door frame assembly in which the mine stopping comprises a plurality of elongate extensible and contractible panels extending vertically in side-by-side relation from the floor to the roof of a passageway in a mine. Each panel comprises a first elongate member constituting the lower member of the panel and a second elongate member constituting the upper member of the panel. Each of the panel members has a web and flanges at opposite sides of the web, one of the members having a telescoping sliding fit in the other. The assembly comprises a rectangular frame having top, bottom and side channel members, the door being hinged to one of these. The frame is mounted in an opening in the mine stopping without any fastening means between the frame and stopping panels thereby maintaining the extensibility and contractibility of the panels.