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By definition, a fume hood is an enclosure that has a movable sash, an upper airfoil, lower airfoil, and baffles. An enclosure without these features is named a ventilated enclosure.
To the user, the most important feature of a fume hood is the sash. The sash, or sash panels, are the pieces of transparent material-usually glass-that are located at the front of the fume chamber and are movable. The sash position has a huge impact on the airflow within the fume chamber, but the sash is also a barrier between the fume chamber and your breathing zone. It offers protection from other hazards, such as fire and explosion. Using the sash properly is one of the most important things you can do, not only to protect yourself, but to also save energy.
The next component to focus on is the baffles. These are normally located in the rear of the hood, and along with the back wall, create the exhaust plenum. The exhaust plenum has the lowest pressure within the hood, so the air naturally wants to flow there. There are usually slots or holes in the baffles to allow the air to flow into the exhaust plenum. There are many baffle designs, and some perform better than others. The baffles are the most critical component in fume hood performance, so users need to pay close attention to them.
The lower airfoil is also a critical component. The sash normally closes onto this airfoil. It is the nose of the work surface. There are many designs, but typically, they are constructed of metal and are designed to create a stream of air that sweeps across the work surface rearward toward the baffles
| 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) | |||
The biggest challenge with fume hood performance is that users usually cannot see the hazards-most are invisible and odorless. Therefore, there is no easy way to know if your fume hood is working properly and protecting you. Many think that face velocity, which is defined as the speed of the air entering the sash opening, is an indication of safety. The ANSI/AIHA Z9.5 Laboratory Ventilation states: "Face velocity had been used historically as the primary indicator of laboratory hood performance for several decades. However, studies involving large populations of laboratory fume hoods tested using a containment-based test like the ANSI/ASHRAE Standard 110, 'Method of Testing the Performance of Laboratory Fume Hoods,' reveal that face velocity alone is an inadequate indicator of hood performance." In fact, most hoods that fail containment testing have acceptable face velocity readings.
So, what causes loss of containment in a fume hood? The two biggest causes are turbulence and pressure shifts (room pressure versus fume chamber pressure).
As a best practice, the lower the sash handle is, the safer the user will be. Hoods should never be used at full open-this is for setup only. Working with an 18-inch opening on a vertical sash is far safer than working at full open.
When you stand in front of the sash opening, your body acts like an airplane wing; the air being drawn into the hood flows over your shoulders and around your sides, creating a low-pressure zone directly in front of you. This low-pressure area in front of you will attempt to pull air from inside the hood outward, creating a loss of containment and possible exposure. This is why you always work at least six inches behind the sash to keep chemicals out of the area of reverse flow.
Next, extend your hands and arms into the hood and move them about. What are they doing to the airflow? Picture yourself in a canoe, your arms are the paddles, and just as the paddles can displace large amounts of water, your arms can displace large amounts of air creating turbulence and disrupting the airflow. This is a recipe for loss of containment. When working in the hood, move your hands and arms slowly and deliberately.
6 Questions to Ask When Buying a Fume Hood:
-Which chemicals will you use within the hood?
-Is a ducted or ductless hood best suited to your needs and available space?
-Where will you place the fume hood in the lab? Consider workflows, access to external exhaust systems, and competing air patterns.
-What size fume hood will best suit your needs? Be sure to consider what (if any) equipment will be enclosed in the hood.
-Are any service fixtures or accessories such as airflow monitors, electrical outlets, water, or gas fixtures required?
-Are base cabinets for acid, solvent, or non-chemical storage required?
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