Light shaft for cellar window has triangular or trapezoidal longitudinal cross sectional shape whose outside wall opposite the housing runs inclined out and up from lower part of shaft

摘要

The light shaft which opens up and is against the building has a triangular or trapezoidal longitudinal cross sectional shape whose outside wall (1) is opposite the housing side and runs inclined out and up from the lower part of the shaft-like component. The angle of the outside wall to the vertical is between 10 and 20 degrees.