| 摘要 |
PROBLEM TO BE SOLVED: To realize a ventilator being inserted into a ventilation hole made through the beam or outer wall of a building and secured in place in order to ventilate the ceiling in which even a grill structure requiring no hood can be waterproofed through a simple and inexpensive structure. SOLUTION: The ventilator has outer end opening 14 to the inside of a grill 13 and substantially tubular closed inner end 15. A vent 18 is provided above and a water return plate 19 having inner end 15 inclining downward is provided between the vent 18 and the opening 14. The tubular part is inclining such that the diameter decreases gradually at least on the inner end 15 side. |
