In Japan, sick house syndrome has been a problem owing to air tight houses and change of a life style.For this reason, the building standard law was revised in July, 2003, and it was defined that 0.5 times ormore per hour need to be ventilated in the case of a residential room.On the other hand, radiation heating systems, such as a floor heating, have spread in the residence inrecent years. The features of these heating systems are that an indoor air-flow distribution is uniform,that the distribution difference of an indoor vertical temperature is small, etc.
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