Product Description
1. Hood Body
The visible part of the fume hood that serves to contain hazardous gases and vapors.
2. Baffles
Moveable partitions used to create slotted openings along the back of the hood body. Baffles keep the airflow uniform across the hood opening, thus eliminating dead spots and optimizing capture efficiency.
3. Sash
The sliding "door" to the hood. By using the sash to adjust the front opening, airflow across the hood can be adjusted to the point where capture of contaminants is maximized. Each hood has its optimum sash configuration. The sash should be held in this position when working in the hood and closed completely when the hood is not in use. The sash may be opened completely to set up equipment, but must be returned to the optimum setting prior to generating contaminants inside the hood.
Hoods are equipped with one of three types of sashes:
• Vertical
Vertical sashes provide the greatest overall access and are the most common.
• Horizontal
Horizontal sashes provide the best access to the top interior of the hood, but do not provide access to the entire width at the same time. However, they can be positioned as a body shield to protect the operator, while enabling access through the sides.
• Combination vertical and horizontal
Combination sashes combine horizontal sash panes, in a vertical rising frame. As such, they offer the advantages of both vertical and horizontal sashes.
4. Airfoil
Located along the bottom and side edges the airfoil streamlines airflow into the hood, preventing the creation of turbulent eddies that can carry vapors out of the hood. The space below the bottom airfoil provides source of room air for the hood to exhaust when the sash is fully closed. Removing the airfoil can cause turbulence and loss of containment.
5. Work surface
Generally a laboratory bench top, or the floor in the case of a floor-mounted hood, this is the area where the work is conducted.
6. Exhaust plenum
The exhaust plenum helps distribute airflow evenly across the hood face. Materials such as paper towels drawn into the plenum can create turbulence in this part of the hood, resulting in areas of poor airflow and uneven performance.
7. Face
The imaginary plane between the bottom of the sash and the work surface. Hood face velocity is measured across this plane.
Product Parameters
| 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) |
Installation Instructions
Adequate planning and preparation is the key. The hood user should know the Standard Operating Procedure (SOP) of the hood and should design experiments so that the SOP can be maintained whenever hazardous materials might be released.
Look for process changes that improve safety and reduce losses to the environment (e.g. more accurate chemical delivery systems vs. pouring volatile chemicals from bottles).
Develop a process to evaluate research proposals ahead of time for potential emissions and look for opportunities to reduce them.
The level of protection provided by a fume hood is affected by the manner in which the fume hood is used. No fume hood, however well designed, can provide adequate containment unless good laboratory practices are used, as follow:
• Ensure the exhaust is operating before beginning work. Check the baffles for obstructions. If the hood is fitted with an airflow monitor, check the monitor's status. Even while working, be alert to changes in airflow.
• When using the fume hood, keep your face outside the plane of the hood. Use the sash for partial protection during hazardous work.
• Work at least 6 inches back from the face of the hood. A stripe on the bench surface is a good reminder.
• Use appropriate personal protective equipment such as splash goggles and gloves. This enhances safety in case of catastrophic spills, run-away reactions or fire. Wear a full face shield if there is possibility of an explosion or eruption.
Detailed Photos
FAQ
1. Fume hoods should be located away from activities or facilities, which produce air currents or turbulence. Locate away from high traffic areas, air supply diffusers, doors, and operable windows.
Air turbulence affects the capability of hoods to exhaust contaminated air. Eddies are created by people passing by and by other sources of air currents.
2. Fume hoods should not be located adjacent to a single means of access to an exit. Recommend that hoods be located more than 10 feet from any door or doorway.
A fire hazard or chemical release incident, both of which may start in a fume hood, can block an exit rendering it impassable. A fire or explosion in a fume hood located adjacent to a path of egress could trap someone in the lab.
3. Fume hood openings should not be located opposite workstations where personnel will spend much of their working day, such as desks or microscope benches.
4. An emergency eyewash/shower station shall be within 10 seconds of each fume hood.
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