PP Spray Fume Hood is a custom-made fume hood to diminish the residues of perchloric acid with an exhaust volume of 920m3 /h. The inside of the deflector is fitted with a spray system that can neutralise the acid gas and then discharge it in the exhaust gas. The advance model features a circulating pump, waterproof socket, water-gas remote control, PP sink and an LED display for convenient user operation.