| 摘要 |
PROBLEM TO BE SOLVED: To simply perform cleaning work of a dust-proof filter without removing a unit such as a wall material or baseboard.SOLUTION: A ventilation structure 2 includes an upper side wall panel 5 provided on a floor 4 in a room 3, and lower side wall panels 7A, 7B provided between the upper side wall panel 5 and the floor 4; and is configured such that an outer frame 20 connects and communicates between an opening part 8 and an opening part 14 of a ventilation duct side branch pipe 13 drawn into the vicinity of the opening part 8. The outer frame 20 is mounted with an inner frame 30, attached to be capable of replacing a dust-proof filter 33, in a freely inserting/drawing manner from a front side. |
