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A fume hood is a special type of laboratory work equipment with an enclosure on top that can contain the effects of the experiment being run within it. It is designed to ensure safety for the user and other inhabitants of the room, and it should be able to filter out any harmful gasses. A fume hood may also provide protection from small explosions or splashes. It must have a built-in mechanism to strongly suck the gasses out of the working area within the enclosure.
Basically, a fume hood is just a large box on top of a lab workbench. This box has a large door or shutter at one side, and may or may not have glass or CRCA sheet walls on other sides. If you need to display some dangerous kind of experiment to an audience on top of an island-type lab table, then you need a glass-walled chamber; or else a wall-facing metal fume cabinet is fine.
As the fume hood needs to suck the air out of the box, it generally has an exhaust fan or air pump inside it above the work area, and a sealed vent pipe connected to it that goes to the outside atmosphere, or to a filter block. There are some types of fume hoods that don't need a vent or air ducts; we'll cover them soon.
The lower part of a fume hood, essentially the area under the table can be utilized too. We can put some under-table storage cabinets in there, or we can keep it open as well.
| Model Specification | WJ-1500A | WJ-1500B | WJ-1800A | WJ-1800B |
| External dimensions of equipment(mm) | 1500(W)*1205 (D) *2400 (H) | 1800(W)*1205 (D) *2400 (H) | ||
| Dimension of works pace (mm) | 1260(W1)*780(D1) *1100 (H1) | 1560(W1)*780(D1) *1100 (H1) | ||
| Panel material | 20+6mm thick butterfly ceramics | |||
| Material of internal lining board | 5mm thick ceramic fiber board | |||
| Diversion structure | Lower air return | |||
| Control system | Button control panel (LCD panel) | |||
| PH value control | The medium is alkaline water solution; manual monitoring, and manual control through acid pump and alkali pump. | |||
| Input power | Three-phase five-wire 380V/50A | |||
| Current for air fan | Not over 2.8A(380V or 220V can be directly connected) | |||
| Maximum load of socket | 12 KW(total of 4 sockets) | |||
| Water tap | 1 set (remote control valve + water nozzle) | No | 1 set (remote control valve + water nozzle) | No |
| Water discharge way | Magnetic chemical pump strong discharge | |||
| Using environment | For non-explosion indoor use, within 0-40 degrees Celsius. | |||
| Applicable fields | Inorganic chemistry experiment; Food, medicine, electronics, environment, metallurgy, mining, etc. | |||
| Ways of Purification | Spray sodium hydroxide solution, no less than 8 cubic meters/hour | Spray sodium hydroxide solution.no less than 12 cubic meters/ hour | ||
| Ways of surface air speed control | Manual control (through the electric air valve to adjust the exhaust air volume or adjust the height of the moving door) | |||
| Average surface air speed | 0.6-0.8 m/s Exhaust air volume: 1420-1890m3/h (when door height h =500mm) | 0.6-0.8 m/s Exhaust air volume: 1760-2340m3/h (when door height h =500mm) | ||
| Speed deviation of surface air | Not higher than 10% | |||
| The average intensity of illumination | Not less than 700 Lux; Standard white and uv-free yellow LED lamps; The illumination is adjustable. | |||
| Noise | Within 55 decibels | |||
| Flow display | White smoke can pass through the exhaust outlet, no overflow. | |||
| Safety inspection | No spikes, edges; Charged body and the exposed metal resistance is greater than 2 mQ; Under 1500V voltage, no breakdown or flashover occurred for 1min test. | |||
| Resistance of exhaust cabinet | Less than 160 pa | |||
| Power consumption | Less than 1.0kw/h (excluding power consumption of fans and external instruments) | Less than 1.2kw/h (excluding power consumption of fans and external instruments) | ||
| Water consumption | Less than 3.2L/ h | Less than 4.0L/ h | ||
| Performance of wind compensation | With a unique wind compensation structure, the volume of the wind will not cause turbulence in exhaust cabinet and will not directly blow to the staff (need to connect to the air compensation system of the laboratory) | |||
| Air volume regulating valve | 315mm diameter flanged type anti-corrosion electric air flow regulating valve (electric contact actuator) | |||
1. All operations that may generate hazardous air contaminants must be done inside a laboratory fume hood.
2. Fume hoods do not prevent accidents or chemical splashes. 3. Hood users must be trained in the proper operation and use of laboratory fume hoods.
4. The hood should not be operated unless it is verified that it is working correctly.
5. Safety glasses (goggles), lab coats, and appropriate chemical gloves must be worn when working in, on, or around the fume hood.
6. Do not put your head in the hood, beyond the sash opening.
7. Do not use the hood for storage of equipment, containers, or chemicals which are not going to be used during the day.
8. Equipment and materials placed in the hood must not block hood slots, airfoils, or otherwise interfere with the smooth flow of air into the hood.
9. Never place or use equipment that protrudes beyond the face of the hood (sash opening). This configuration will disrupt air flow of air into the hood and reduce its efficiency.
10. Keep all equipment and materials at least 6 inches behind the plane of the sash (hood face), this will improve containment capture. A stripe (tape) on the hood working surface is a good reminder.
11. Place all bulky equipment away from the sidewalls to allow air flow around the equipment.
Inside the fume hood, there are facilities to let you work. For example, there is almost always some good lighting system in the cabinet. There should be LPG and water connections in the hood, and a drain too in case of spills.
The air suction system is generally placed on top of the box or on the backside (the side towards the wall). This system is generally made up of a strong exhaust fan or air pump and accompanying air duct. The strength of the pump lies in the airflow strength starting from 4 to 8 meters per second to more.
When the exhaust is running, it sucks in volumes of air through the open side (never run the exhaust with the hood completely closed) and vents it through the duct. The duct may throw the fumes right outside the room in the air, or may run it through a filtration system, depending upon the severity of the experiment.
Some advanced laboratory fume hoods have microcontrollers inside them, which you can use to control the exhaust. You may set various suction levels for given setups and later use these quick setups for particular experiments. You can also control the fan/pump power during the experiment too, and the lights as well. The control panel can also warn you about various inconsistencies, like the presence of smoke or fire or too high a shutter
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