| 摘要 |
PROBLEM TO BE SOLVED: To provide a ventilation fan to have a hole to guide the piping of an air conditioner, arranged on the wall surface of a housing, to the outside of a housing. SOLUTION: A small ventilation fan 2 is arranged in a hole 1 through which the piping of an air conditioner on the wall surface of a housing is guided to the outside of a housing. The small ventilation fan 2 is arranged in a hole 1 through which the piping of the air conditioner is guided. After arrangement thereof, a filter 3 to prevent entrance of dust is arranged in the indoor side. A flap 4 to prevent entrance of wind and rain may be arranged on the outdoor side. A method to arrange the ventilation fan is that a groove 5 previously formed in a piping hole may be utilized. This constitution very simply arranges the ventilation fan, being safe in terms of prevention of crimes, without needing a special work. |
