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Fume Hood Tips
Fume hoods are the primary engineering controls used to control inhalation exposures to hazardous substances in University research buildings. There are other types of local exhaust such as vented enclosures for large pieces of equipment or chemical storage, and snorkel and canopies for capturing contaminants near the point of release. Work is performed directly underneath the canopy or snorkel and is typically intended for machines such as gas chromatographs or mass spectrometers. This type of local exhaust does not guarantee 100% removal of gases.
Size. A basic starting point when shopping for and specifying a fume hood is size. What size is the working area required for your application? What size is the available space on the factory floor or the laboratory for a fume hood? Best Technology builds custom fume hoods, so even if your size requirements are unusual, we can build a fume hood to fit your space.
Materials. Some chemistries require specialized materials for containment. Highly corrosive acids at high concentrations, for example, often require a fume hood constructed from polypropylene rather than stainless steel for better corrosion resistance. For hydrofluoric acid, polycarbonate is the preferred material for the sash, to avoid etching of a glass window. Knowing the expected chemistry that will be put in the fume hood is crucial to ensuring years of reliable functioning.
Standards. Does your fume hood need to meet certain industry standards? Does your chemical process need to meet other specialized standards or requirements? Sometimes a "one-size-fits-all" fume hood just won't work. In those cases, look to the applications engineers at Best Technology for a customized fume hood.
Window orientation. Some fume hoods use a horizontal sliding window, which limits the access of the operator to the working area inside the fume hood. Look for a vertically sliding window (sash), so that users have more available working area in the interior of the fume hood. Best Technology offers fume hoods with counterbalanced, vertically sliding windows.
| 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 hoods are a flexible engineering solution for a variety of chemical handling needs. Here are a few of the many possible options and features that can be included in a fume hood:
A properly operating and correctly used fume hood will protect workers by containing vapors, dusts, gases, and mists. The sash can also act as a shield to workers from splashes and minor explosions or fires that may occur inside the hood. A fume hood is not designed to protect the skin or hands of workers placed inside the fume hood during activities. Personal Protective equipment (eye protection, gloves and lab coat) must be used to protect the skin that is exposed to the open area of the fume hood.
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