The present invention relates to a device for supporting a filter unit on the ceiling of a clean room that requires a high level of cleaning, such as semiconductor factories, operating rooms, laboratories, etc. The present invention is fixed to the ceiling of the building to install the filter unit on the ceiling of the clean room In fastening the filter support frame between the connection frame and the adjustable connection to it, the upper part of the connection is fixedly inserted into the connection frame, the lower part of the connection is fastened to the coupling nut, and the lower side of the coupling nut It is to be fastened to the egg (R) bolt inserted into the head of the filter support frame, the connection between the upper end has a right thread, the lower end has a left thread when rotating the coupling nut inserted into the length of the connection between Can be adjusted so that the height of the filter support frame into which the filter unit is inserted can be arbitrarily adjusted. To.
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