Gänserndorf manufacturer of steel doors, frames, fire gates and glazing systems, one of the larger central European steel-door houses, holding 16 live VKF recognitions — Brandschutztüren (6), Brandschutztüren mit Verglasung (6) and vertical fire-rated glazing (4). Its frames are as much of the business as its leaves, which is the part of a rated doorset that most often governs whether the assembly performs as tested.