| 摘要 |
<P>PROBLEM TO BE SOLVED: To effectively restrain fire or noxious gas from flowing to the next room side through each kind of holes made in a wiring box or a gap made also between the margin of an opening and the marginal section of a through-hole on the rear face of a wall, and also to improve the soundproofing performance. <P>SOLUTION: An annular block part 11B, which is to be applied in elastically transformable state to the marginal section of the through-hole H at a rear wall face, is made at the margin of the block plate 11A made of thermally expansive heat-resistant rubber, which is mountable on the side of an opening within the wiring box 2 arranged in a state of opened to the surface side through the through-hole H in a wall W, and also substantially blocks the opening of the wiring box 2 by thermal expansion. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
