| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive vent hole structure with a simple structure capable of preventing the intrusion of fire and heat by blocking a venting way during a fire of an adjacent house. SOLUTION: A fire resistant thermal expansion heat insulator 18 is installed in an interior of the venting way 2 penetrating an outer wall 1. An amount of the fire resistant thermal expansion heat insulator 18 is an amount of blocking the venting way 2 at thermal expansion. The fire resistant thermal expansion heat insulator 18 can be also attached to an inner circumference face of a vent pipe 7 penetrating the outer wall 1, or to the interior of a ventilation hood 8. COPYRIGHT: (C)2009,JPO&INPIT
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