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Ductless fume hoods or fume cupboards are often used in laboratories to capture and remove hazardous substances from the air which are produced during certain laboratory applications. These can be gases, vapours, aerosols or particulates (dust). The fume hood encloses a work bench area that has a fan unit at the top. This sucks the air from the front opening upward through filters which trap the hazardous substances. Clean air is then expelled back into the laboratory space. Ductless fume foods are seen as an easy to install alternative to more traditional ducted hoods, requiring little existing infrastructure and not requiring duct work.
There are a few types of filters that could be required in a fume hood and selecting the correct type of filters for your application is imperative to protecting yourself and your colleagues from any hazardous substances in the air. The most appropriate type of filter is dependent on what types of chemicals you will be using in your daily handlings.
Activated carbon filters are created by steam heating charcoal and graphite at high temperatures (up to 980°C). This separates the layers of crystalline carbon and creates a large internal volume which allows for adsorption of chemical particles to occur. The activated carbon is then impregnated by pre-adsorption of a chemical that will react with the pollutant that the filter is intended to trap. Four different types of activated carbon filters are commonly provided. These are filters that can trap organic, ammonia, formaldehyde and acid vapours.
| 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) | |||
Other Hood Types
• Ductless Hood is another type of enclosure hood. Ductless hoods pass air from the hood interior through an absorption filter and then discharge the air into the laboratory. These types of hoods are only suitable for use with nuisance vapors and dusts that do not present fire or toxicity hazards. These types of hood have very specific uses.
• Capture Hoods are ventilating devices that can be positioned to pull in contaminants that are produced outside of a hood. A sufficient velocity called the capture velocity is necessary to "grab" the contaminant and move it into the hood. They are generally used in welding and grinding operations.
• Receiving Hoods are devices generally used to exhaust heat, water vapor, odors, and other non-hazardous materials. They are not a laboratory hood and generally are not effective for exhausting toxic or flammable materials.
• Biological Safety Cabinets are special safety enclosures used to handle and contain pathogenic microorganisms or chemotherapeutic agents. Biological safety cabinets are NOT laboratory fume hoods. Biological safety cabinets provide protection for the product and also protect laboratory personnel by utilizing vertical airflow.
• 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.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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