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Fume hoods can be categorized into two main types - ducted and ductless. A ducted fume hood is a ventilated enclosure typically designed to limit exposure to fumes and vapors (either hazardous or non-hazardous) as well as dust or particulates, depending on model. Fume hoods can be designed to protect the operator, the work surface, or both.
Ductless fume hoods rely on carbon filters activated to adsorb specific chemicals or chemical families, and/or electrostatic pre-filters for the capture of dust, as well as safety HEPA/ULPA filters for the capture of particulates or biologicals. Rather than exhausting the fumes, vapors, or particulates to the environment, filters in a ductless fume hood scrub and recirculate air. Ductless fume hoods can be designed to protect the operator, the product, the environment, or any combination of the three.
| 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) | |||
Advanced ductless carbon filtration technology offers a safe, high performance alternative to conventional ductless fume hoods for a broad range of applications.
Fume hoods have been used in laboratories for generations. In fact, some historians credit the first fume hood to either Thomas Jefferson or, later, Thomas Edison both of whom are said to have used the natural draft of a fireplace and flues to exhaust unwanted vapors during experiments. It was, however, Joseph Priestly who created the first laboratory chemical exhaust hood in 1790. With the introduction of electricity and electrical engineering, the invention of the first blower motor paved the way for fume hoods as we know them today. In 1923, the first ducted fume hood was installed at the University of Leeds, UK.
The introduction of HEPA filters in the 1950s opened the doors to ductless fume hood varieties which have been in use in a variety of laboratories for more than 40 years. Since that time, cabinets have gone through a number of changes that have expanded the applications they serve.
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