What are the types of fume hoods

There are many kinds of fume hoods, which can be divided into various types according to different classification standards. The following are some common fume hood classification methods and their corresponding types:

First, classification by function and application scenario

Standard fume hoods: Suitable for most chemical laboratories, provide basic chemical fumes, vapors, and particulate control.

Biosafety hoods: Specifically designed to handle biohazards, with additional safety measures to prevent the spread of microbial aerosols.

Explosion-proof fume hood: designed to handle flammable and explosive substances, with fire and explosion-proof characteristics.

Walkable fume hood: Allows experimenter to work inside the fume hood, providing greater operating space.

Second, according to the design characteristics of classification

Ductless fume hood: Intelligent design, with self-purifying filter box, remote control, suitable for specific occasions where local control of pollutants is required.

Table hood: Small size, suitable for placing on the bench, suitable for limited space laboratory environment.

Third, according to the air flow organization classification

Full exhaust fume hood: The entire work area is in a state of exhaust, and all gases are discharged from the laboratory.

Partial exhaust fume hood: Only some areas or parts of the area in the exhaust state, other areas are in the positive pressure state.

No exhaust fume hood: there is no exhaust in the fume hood, and the gas is purified through the filter and then discharged to the outside.

Fourth, according to the exhaust air classification

Upper exhaust type: suitable for cold process fume hood, to ensure uniform wind speed in the working area.

Lower exhaust type: fume hood suitable for thermal processes to ensure that harmful gases do not escape from the lower part.

Upper and lower simultaneously exhaust type: suitable for the process of unstable heat generation, the ratio of upper and lower exhaust air volume can be adjusted to obtain uniform wind speed.

Fifth, by material classification

All-steel fume hood: The main structure and internal components are made of stainless steel or carbon steel material, with good corrosion resistance and durability.

Steel-wood fume hood: The main structure is made of steel, and the internal parts are made of wood, which can effectively reduce noise and vibration.

All wood ventilation cabinet: the main structure and internal components are made of wood, with good sound insulation and thermal insulation effect.

PVC fume hood: The main structure and internal components are made of PVC material, with good corrosion resistance and durability.

Sixth, classified by other specific functions

Supplementary air fume hood: suitable for heating or temperature and humidity control requirements of the room, through the supply air from the outside circulation in the cabinet and outdoor way to save energy.

Variable air volume fume hood: by adjusting the sensor of the valve to change the air volume to achieve the given surface wind speed, suitable for occasions requiring high precision.