| 摘要 |
PURPOSE: A ventilation opening having a housing with an edge and separable bracket and cap is provided to control the amount of flowing air by controlling the height of a housing and a cap. CONSTITUTION: A ventilation opening comprises a housing(110), a bracket(120), a nut, a screw, an a cap(150). The housing is installed in a ventilation hole formed in a ceiling. Multiple protrusions are formed on the inner surface of the housing. A protrded edge(112) is formed in the edge of the housing. The bracket is detachably installed in the housing. A first hole is formed in the center of the bracket. The nut is inserted into the first hole of the bracket. The screw is coupled to the nut. The cap is inserted into the screw and is installed in one side of the housing.
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