| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat radiation device for an electrical apparatus housing box which facilitates the cleaning or replacement of a filter. SOLUTION: A ventilation unit 5 is attached to the aeration hole of a box main part and fixed to the box main part with screws. The ventilation unit 5 is composed of a fan 7, a finger guard 8 which prevents fingers, etc., from being mistakenly inserted into the fan 7, an waterproof rubber 9 which prevents rain water, etc., from penetrating through the aeration hole, an approximately square filter attachment device 11, to which a filter 10 which prevents dust from penetrating into the box part, is attached and a box-shaped hood which covers the filter attachment device 11 and whose surface attached to the box main part and bottom surface in a state wherein the hood is attached to the box main part are opened and those components are integrally fixed to each other with screws 13, 13, 13 and 13. Filter attachment device side-retaining parts are formed on two facing sides of the filter attachment device 11. Hood side retaining parts which are formed on the hood are retained with the filter attachment device side retaining parts. |
