Improvements in or relating to the Ventilation of Strong Rooms.

摘要

15,641. Lee, C. T. June 29. Ventilators, terminal.-Consists of a strong-room ventilator comprising a cast-steel box of zigzag formation adapted to be built into the wall with the opening on one side out of alinement with that on the other. The box is provided with steel grids d, which slide in grooves d1, and are maintained in place by the top of the box. Flanges f grip the box to the stonework and prevent it from being drawn as a whole from the wall.