| 摘要 |
PURPOSE:To detach plural dust collecting elements in one step by providing an element frame for discretely and freely detachably housing the elements and a mechanism for freely detachably supporting the element frame in a casing. CONSTITUTION:An outer frame 3 is fixed to the open edge of a ceiling board 2 dividing a ceiling space 1. A suction grill 6 free to open and close is arranged in the outer frame 3. A casing 16 opened downward is set in the space 1 in opposition to the grill 6. Plural dust collecting elements 20 are set in the casing 16. An element frame 19 for discretely and freely detachably housing the elements 20 and the supporting mechanisms 43 and 47 to attach and detach the frame 19 to and from the casing 16 through the outer frame 3 are provided in the casing 16. Consequently, plural dust collecting elements can be detached in one step. |
