| 摘要 |
PROBLEM TO BE SOLVED: To perform ventilation without remarkably reducing the degree of cleanness of indoor air by positively providing an exhaust air fan and a fresh air introduction port in a room, and at the same time by mounting a filter member that can eliminate dust and pollen being contained in the fresh air to the fresh air introduction port. SOLUTION: An exhaust air fan 2 and a fresh air introduction port 4 are provided on walls 1 and 3 in a room, respectively. A window louver 5 is provided at the outermost side of the fresh air introduction port 4, and first and second filters 6 and 7 are provided at the inner side. When the ventilation of indoor air is required, the exhaust air fan 2 is operated for discharging smoke and carbon dioxide gas in a room and fresh air can be introduced while contamination substance such as dust and pollen are eliminated in advance, thus maintaining the degree of cleanness of indoor air. Glass wool that does not lose a filtering function even when it is wetted and a non-woven cloth material such as Japanese paper with superior adsorptivity for adsorbing fine dust should be used for the first and second filters 6 and 7, respectively. |
