APPARATUS FOR DRAWING OFF GROUND AIR

摘要

The invention relates to an apparatus for drawing off ground air under the foundation slab of a house. A tube (1) is placed in an excavation made some meters away from the house and the bottom end part of the tube is downwardly open and is provided with a plurality of rows of holes (2) through which a blower (4), arranged inside the pipe, draws the air from the ground. The ground air which is withdrawn departs via an evacuation duct (7, 9) opening out above the ground surface (10). A lid (3) is arranged airtight at the upper end of the tube. The evacuation duct connects up with the tube in an area (8) above the blower.