Vent for an underground housing

摘要

The vent consists of a tube (10) connected to the inside of an underground chamber connected by its end to a cap (30) situated on the outside of a duct (11) set vertically in the ground The inner volume (31) of the cap is connected to the inside of the duct through a hole (32) in its side wall. The upper end of the duct is fitted with a grating (14), and its lower end is connected to a drainage pipe (15).