Abstract: A screen structure which includes a number of interspaced carrier members and at least one long screen member having a base flange which is adapted to be mounted in a holding track through a tilting insertion motion. At least one edge portion of the base flange and a remaining space is left behind the edge portion and the respective holding track. Profiled filler members are endwise insertable into at least a partial length of the remaining space for stabilizing the base flange relative to the carrier member. At least one end of each filler member has a longitudinally projecting end portion forming a resiliently bendable finger of a reduced cross section such that, during an insertion, the finger is bendable away from an adjacent wall portion of the carrier member. The outer end portion of the finger is provided with a lateral protrusion which is adapted to snap outwardly behind an end or recess edge thereof by the end of the insertion.