... water nozzle 2.laboratory-special tank 3.Fire-proof, non-toxic, long-standing service, Features:1.Table-board use fire-proof ... the condition of max speed, can change air or exhaust toxic 20times/h. Design features:1. Integrated design, moisture proof, anti ... , long-standing service.2. noise reduction attaching national standard3. exhaust toxic gas Ventilation chemical desk (lab euipment)