| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sash which can improve the heat insulation property while performing ventilation through a frame. <P>SOLUTION: A sash includes a heat insulating frame 2, and the heat insulating frame 2 includes a ventilation passage 5 communicating with indoor and outdoor sides, heat transfer parts 21a, 21b, and 21c for transferring heat to the air flowing through the ventilation passage 5, and a resistance application part 6 for applying resistance to the air flowing through the ventilation passage 5. <P>COPYRIGHT: (C)2013,JPO&INPIT |
