The structure of the fume hood is up and down, with a vent on the top and a fan.
There are some guide plate on the upper cabinet, circuit control touch switches, power sockets, etc., through the use of tempered glass, can be moved up and down for human operation.
The lower cabinet uses the experiment wall bench desk style, above the table, below is the cabinet body. The table can install small water cup and water tap.
Fume hood has variety of materials, all steel, steel&wood, aluminum&wood, plastic, PVC structure, the table is the place of direct contact with the operator, the solid physiochemical board, stainless steel plate, PVC, ceramic material composition and so on. The fume hood is generally installed on the wall.
The middle of the front is the transparent door (mostly glass)which could be move up and down, open height is generally 100-600 mm.it is a experimental work face after the door.there are water pipes, sewers, power, vacuum pumps, gas pipeline and other experiments need to connect, with a protective cover on the lighting.The air is pumped out of the exhaust fan in front of the cabinet, or through the pipe (known as full ventilation), or by recirculation (ductless ventilated). Ventilation cabinet
(1) Exhaust is too small
(2) When the front glass door is too large, an alarm will be given to alert the operator. The internal fan speed and the lights are adjustable.
When using the person station or sitting in front of the cabinet, the glass door is as low as possible, the hand through the door into the cabinet to carry out the experiment. Because the exhaust fan is pumped through the open door, the harmful gases do not overflow in normal circumstances.