Patent ID: 7976599

Claim:
A clean bench comprising: a worktable on which polycrystalline silicon is placed; a box part which includes side plates to surround three sides except a front face of a working space above the worktable and which includes a vertically extending part, extending from the bottom to the top of the box part, and an upper extending part, extending above the working space; a ceiling plate, which covers an upper side of the working space, with supplying holes formed in the ceiling plate of the box part, which supply air from the upper extending part onto an upper surface of the worktable; an ionizer, which ionizes the air supplied from the supplying holes to the working space and removes static electricity on the worktable; suction holes formed in the side plate of the box part, which suction air from the working space; a closed loop communicative route which communicates between the suction holes and the supplying holes; a partition dividing the vertically extending part from the upper extending part; a blower, which sends the air to the upper extending part, is provided in the vertically extending part and is disposed to contact with the partition; a worktable communicative route connecting a working surface of the worktable to the communicative route at a lower side surface of the worktable.