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A fume hood essentially looks like an enclosed industrial workbench. To break it down, a fume hood is made up of:
The body: The body of the fume hood contains a work surface, enclosed completely on three sides, on which lab personnel can conduct their experiments / research.
The sash: The sash is the fourth side to the hood, basically a window between the employee and the volatile compounds he or she is working with.
The exhaust duct: The exhaust duct releases any contaminated air to the outside. Usually this duct is connected to the building's HVAC infrastructure, but there are ductless fume hoods available if flexibility, lower cost, and energy efficiency are key drivers for your business or institution.
The baffles: The baffles are slotted panels that control the amount of air flowing into the hood from the surrounding environment
| 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) | |||
A fume hood sash is a glass door located at the front of the fume hood that opens and closes, serving as a doorway to the workstation. The sash is an important safety component, offering protection and containment from dangerous chemicals and other materials.
Successfully using a sash during fume hood operation involves understanding the role of the sash, the type of sash you need for your environment and safety protocols that must be in place.
Fume hoods are designed to limit a person from exposure to hazardous fumes, vapors or dust. They are essentially an enclosed industrial workbench with a built-in exhaust system, and feature three enclosed sides with a fourth side open for a worker to operate.
Fume hoods have a fan that creates a positive air flow to pull contaminants to the filtration system. There are two types of fume hoods - ducted and ductless and in both, the sash plays a critical role in worker safety.
Although facilities that have ductless fume hoods typically use only a few chemicals in them, the sash is nonetheless important. That's because a fume hood sash acts as a shield. If a fire occurs, for example, the sash will contain the fire and keep it from spreading.
The sash also helps control how the air moves through the fume hood by pushing harmful vapors and fumes toward the built-in exhaust system.
• 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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