| 摘要 |
PROBLEM TO BE SOLVED: To prevent a filter buried in a ceiling from falling down when a suction grill is opened, and easily take out the filter when it is installed on a floor. SOLUTION: A dog-legged folded part 5a is provided by folding an insertion side tip end of a filter 5 inwardly, and a notched part 3b corresponding to the folded part is provided in a filter guide 3a interior end provided in a suction grill 3. In contrast, there is provided a filter cap 6 inside a support part 4 of a casing 1 with its tip end protruded corresponding to the folded part 5a of the filter 5. When the suction grill 3 is opened, the filter 5 is pushed out with a protrusion 6a of the filter cap 6, and the folded part is tentatively stopped between the protrusion 6a and the filter guide interior end of the suction grill 3 so that when the suction grill 3 is opened, the filter 5 when buried in the ceiling is prevented from falling down, while the filter 5 when installed on a floor is pushed out to easily take out. |
