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| Material: | Stainless Steel |
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The operation cost of a ductless fume hood is substantially lower than a traditional labratory fume hood because it requires no installation. Each unit has been calibrated, certified for operation and ready to use upon delivery. Conventional hoods require installation of a blower, ductwork through the building and assembly of the fume hood. All of this takes time and money.
HVAC-free ductless fume hoods can be moved and operational in minutes where conventional laboratory enclosures may be out of service for weeks. Beyond the power cord, a ductless enclosure has no external connections preventing a location change and can be placed on a cart and moved from room to room. Traditional lab hoods require a third party to move exhaust duct work and other connections before the unit may be relocated.
Ductless filtration recycles existing room air while cleaning the chemical mixture. No harmful fumes or vapors are released into the environment. The bonded carbon filter can be safely disposed of in a landfill once saturated.
Advanced monitoring and safety controls have allowed ductless hoods and filtered workstations to continue gaining acceptance in a variety of laboratory applications. Constant monitoring of face velocity and filtration is critical to the safety of laboratory personal.
| 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) | |||
Most laboratory safety professionals hold the position that even if a fume hood's face velocity is within safety standard recommendations, it will not serve as a guarantee of safe fume containment. Although one cannot argue against this position, it is somewhat similar to saying that a good braking system will not serve as a guarantee of vehicle safety. As in many situations, ensuring total safety is a more complex task and requires addressing multiple issues.
If the necessary fume hood average face velocities are determined by on-site fume hood containment testing, then the face velocity should serve as a benchmark for safe containment if other important aspects particularly the room ventilation attributes remain unchanged and safe work practices are followed. Periodic re-testing of fume hood containment on an annual basis is still advised. Ventilation system designers should allow some extra capacity in exhaust and supply makeup air systems in case individual fume hood exhaust airflows must be increased above a manufacturer's recommendation to attain the average face velocity required for acceptable fume containment.
• 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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