VENTILATION STRUCTURE OF BUILDING

PROBLEM TO BE SOLVED: To provide a ventilation structure of a building capable of preventing the occurrence of the condensation inside of an exterior wall of the building by forming the ventilation structure of the building pressurizing an indoor space in the building to the outside. SOLUTION: As an air supply means sending fresh air to the indoor space 2 from the outside 5, for example, an inlet port 8 communicating with the indoor space 2 and an under-floor space 4 is formed in a floor 11, and an under-floor air supply blower 6 provided in the under-floor space 4 communicates with the outside 5 through a ventilation duct 7. As such a fact that a drainage means is provided to an upward position from the center in the vertical direction of an outer cover of the building, for example, a first drainage course 9 connecting the indoor space 2 and an attic space 3 is provided on the ceiling 12, and the attic space 3 and the outside 5 are connected by a roof 13 by a second drainage course 10. Even if the under-floor air supply blower 6 is operated to pressurize the indoor space 2 in the case of heating in winter, the pressure of the indoor space is not increased since the drainage means is provided to the upward position of the building, and the occurrence of the condensation in the inside of the exterior wall of the building can be prevented. COPYRIGHT: (C)2005,JPO&NCIPI