| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a sanitary vent hole capable of being installed by a simple installation operation without a structure such as a branch pipe or an indoor space. <P>SOLUTION: A sanitary vent hole device comprises: an inner tube 10 having an upper face 10A, a lower face 10B connected to a vent hole and side faces 10C provided with at least one opening section 11; an outer tube 20 which has open upper and lower ends as well as side faces 20C enclosing the inner tube 10 to form a ventilation passage between the side faces 20C and the side faces 10C of the inner tube 10; and an opening/closing valve 30 which opens the opening section 11 when air flows from an inner side of the inner tube 10 to the vent hole and closes the opening section 11 when the air flows through the ventilation passage. <P>COPYRIGHT: (C)2012,JPO&INPIT |
