Ventilation device

A ventilation device for use at a door, comprising an elongate member adapted to serve as part of a side frame structure of a doorway, said elongate member comprising a box structure which is L-shaped in transverse cross-section, the box-structure being adapted such that the shorter leg projects laterally so as an overhang a door and serve as a stop for the door, an air conduit being defined between spaced walls of the box structure for through passage of ventilating air, said elongate structure including an inlet port to said conduit and a discharge port from the conduit, one of said ports being located in the shorter leg of the box structure such that said one port faces downwardly, and a reinforcing structure extends between the spaced wall portions of the box structure in said shorter leg, said reinforcing structure defining openings for passage of air via said one port in the shorter leg.