An exposure preventive device is provided that suppresses contamination of an exhaust passage of a cabinet with an exposure preventive device. The present invention is an exposure prevention tool 1 which is installed in a work room 3 such as a safety cabinet 10 and used when preparing a medicine or an organic solvent. The exposure prevention device 1 has a transparent shielding plate 11 standing so as to partition the leading edge suction port 51a and the exposure prevention device suction port 6 forward and backward, and extends rearward from the lower end of the shielding plate 11 and has a thickness. A support plate 12 having a suction port penetrating in the direction, and a bottomed cylindrical suction portion 13 extending downward from the support plate 12 at the periphery of the suction port, and an exhaust port 13d is provided on the side wall of the suction portion It has been. [Selection] Figure 1【課題】暴露防止具付キャビネットの排気路の汚染を抑制する、暴露防止具の提供。【解決手段】本発明は、安全キャビネット１０等の作業室３に設置して、薬剤や有機溶剤の調製を行う際に使用する暴露防止具１である。暴露防止具１は、前縁吸引口５１ａと暴露防止具用吸引口６とを前後に仕切るように立設される透明な遮蔽板１１と、遮蔽板１１の下端から後方へ延出するとともに厚み方向に貫通する吸込み口を有する支持板１２と、吸込み口の周縁において、支持板１２から下方へ延出する有底筒状の吸込み部１３とを備え、吸込み部の側壁に排気口１３ｄが設けられている。【選択図】図１
