Sliding window or door ventilation - involves slotted bar or rail mounted in wall opening or blind frame

摘要

The system for introduction of air is esp. applicable to sliding doors and sliding windows. A batten or rail (4), with ventilating slits (6) in it, is fitted in the doorway or window opening or on the blind frame (8). It is pref. located at a short distance from the door or window frame (2). Slits may be arranged so that they are covered by the frame when the door or window is closed. Battens may be in two parts, and of width corresponding to frame width. This is simple and inexpensive, and easily mounted.