Whole steel structure; Fluctuation box adopts 1.0 mm cold-rolled steel sheet bending, stamping, its surface is except oil, acid, phosphate as antirust processing, again electrostatic fenmei spraying EPOXY protective layer do naisuanjian corrosion resistant surface treatment, its spray EPOXY protective layer by falling objects adhesion impact test unqualified; Lining and guide plate choose 4mm resistance times special board, in part of 3-sectional exhaust design, which can eliminate the exhaust corner with different density of the gas discharge; effective The control panel is located in outside side pillar board, convenient observation and operation, removable maintenance. Ventilation bar face using 1.27 mm thick core physiochemical board has antibacterial, wear-resisting, prevent acid-base, corrosion resistant, easy cleaning, maintenance convenience etc. Can adopt p 5mm thick explosion-proof window counterweight balance device with toughened glass, slide freely, can stay on track any position; Main window glass can fluctuate slide freely, be convenient for the user operation. Anchor adopted M12 adjustable bolts and mould combination anchor, prevent slippery vibration reduction, Distribution control panel: power and control panel embedded in the case on the right side, removable, easy maintenance, The secondary circuit control systems, Lighting using circular energy saving lamp, hidden from the roof hole, not with ventilation cabinet experimental gas contact, easy change, the brightness of completely satisfy requirement of experiment, Side pillar take two to 10/220V waterproof multi-purpose socket.