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| Material: | Stainless Steel |
| Type: | Bypass Type |
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Before you buy a fume hood, it's important to know what fume hoods are and what they are not. Fume hoods are a primary means of safety from hazardous fumes and vapors.
A fume hood is just one part of a whole system that includes a base cabinet (for benchtop hoods), a work surface, ductwork, and exhaust blower. When purchasing a fume hood, the first thing you need to know is what size fume hood you need. The questions to ask yourself include: How much space do I have? Am I putting the fume hood on an existing countertop? If so, how deep is it? It's important to know that all work done inside a fume hood needs to be at least six inches behind the sash and that there needs to be some clearance underneath any equipment in the fume hood.
Compatibility also comes into play when looking at a fume hood purchase. This includes knowing the types of chemicals you'll be working with. Find out if you need personnel protection only or product protection also. If you are working with perchloric acid, you will need an exhaust wash-down feature. If you are working with delicate instruments or powders, you may need a constant volume air movement hood, versus a variable air volume hood
| 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) | |||
Fume hood testing not only measures performance, but also demonstrates how user behavior influences the hood's ability to keep them safe.
A chemical fume hood is an exposure control device and its purpose is to contain hazards and protect the user from exposure. A fume hood is also part of the overall laboratory mechanical system and there are a variety of potential causes of failure that can occur, both within and outside the user's control. A cause of failure that is often overlooked is the user's own work practices.
The only way to know for sure if a hood is losing containment is to run a test. When doing containment testing, at least 25 percent of failures are caused by user work practices. If a fume hood is performing poorly, the lab manager may not be able to replace the hood or revamp the laboratory ventilation system, but they can educate the user to help protect themselves by ensuring good practices and expanding their knowledge of how fume hoods perform best.
• 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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