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Fume hoods, or fume cupboards, work to ensure the safety of lab personnel while working with hazardous materials by continuously delivering airflow away from the user. When used properly, fume hoods can prevent users and the environment from toxic gases, explosions, and spills.
Ducted fume hoods have a base, work surface, hood, blower and ducting that carries the air outside of the building. The engineer of the heating, ventilation and air-conditioning (HVAC) system needs to determine if your room has enough air to provide the necessary volume of ventilation to the hood.
Ductless fume hoods operate off a carbon filter system that recirculates filtered air into your building. Ductless hoods are often referred to as re-circulating range hoods. They filter the air and then return the clean air back into the workspace. They are self-contained filtered laboratory enclosures. Their primary features are mobility, they save energy, are easy to install and cheaper because no ductwork is required.
| 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) | |||
Laboratory safety and workload should be the primary deciding factors in your decision. In a ductless fume hood, there should be no extreme heating, no more than 10 chemicals should be used per application, small volumes of chemicals should be used (approximately 500 ml or less) and exposure time should be within 2-3 hours per day.
There are a range of filters that have different chemical trapping capacities, but if your application doesn't match available filters you'll be required to move forward with a ducted fume hood. Talk to your fume hood provider about the various filters for chemical groups.
Determine how often you will be replacing your carbon filter, this will also give you a more accurate financial cost. Keep in mind that the filter life depends on the chemicals used, evaporation rate, chemical volume, duration of usage and the temperature of the chemicals.
Advantages and Disadvantages of Ducted Fume Hoods
| Advantages | Disadvantages |
| Safer for lab workers | More expensive |
| Can handle a wide range of chemicals | More difficult to install |
| Easy to operate and maintain | Stationary in the lab |
| Exhaust system keeps contamination outside lab | More difficult to move or relocate |
| Uses more energy |
| Advantages | Disadvantages |
| Less expensive | Handles Limited chemicals |
| Easy to install | Need to replace filters |
| Mobile in the lab | Not as effective at removing chemical fumes |
| Easily moved or relocated | Not for constant use |
| Use less energy |
• Hoods should be evaluated by the user before each use to ensure adequate face velocities and the absence of excessive turbulence.
• In case of exhaust system failure while using a hood, shut off all services and accessories and lower the sash completely. Leave the area immediately.Is A Ducted Fume Hood or Ductless Best for My Laboratory ?
So, how do you determine which is the right fume hood for your laboratory ducted or ductless?
Here are some questions to ask yourself:
1. Do you work with more than 10 different chemicals?
2. Are you working with small or large volumes of chemicals?
3. Does your lab have a high volume of inexperienced people working with chemicals, such as a university lab?
4. Does your building have an HVAC system and a team to manage it?
5. Is mobility necessary for your operation?
6. Do you have techs that can properly maintain a system, e.g. changing out filters?
7. Will the chemicals you are using adequately filter through carbon?
Answering these questions about how you work with chemicals in your lab will help you determine the appropriate application for your needs.
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