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| Material: | Stainless Steel |
| Type: | Bypass Type |
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A laboratory fume hood is a ventilated enclosure where hazardous materials can be handled safely. The purpose of the hood is to contain contaminants and prevent their escape into the laboratory. This is accomplished by drawing (by air flow) contaminants within the hood's work area away from the user thereby preventing and minimizing inhalation and contact with hazardous materials.
To create airflow into the hood, an exhaust blower "pulls" air from the laboratory room into and through the hood and exhaust system . A baffle, airfoil, and other aerodynamically designed components control the patterns of air moving into and through the hood.
Fume Hoods must be located away from heavy traffic aisles and doorways so that persons exiting the lab do not have to pass in front of the fume hood. The potentially dangerous portion of an experiment is usually conducted in a fume hood. Many lab fires and explosions originate in fume hood and a fume hood located adjacent to a path of egress could trap someone in the lab.
There must be two exits from rooms where new fume hoods are to be installed. If this is not feasible, the fume hood must be situated on the side of the room furthest from the door. A fire or chemical hazard, both of which often start in a fume hood, can render an exit impassible. For this reason, all labs with fume hoods are required to maintain two unblocked routes of egress.
| 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 should be located within the laboratory to avoid cross currents at the fume hood face due to heating cooling, or ventilation supply or exhaust diffusers.Cross currents outside a hood can nullify or divert air flow onto a hood, negatively affecting its capture ability.
•Sufficient makeup air must be available within the laboratory to permit fume hoods to operate at their specified face velocities. A fume hood exhausts a substantial amount of air. Therefore, additional makeup air must be brought onto the room to maintain a proper air balance.
• Windows in labs that have fume hoods must be fixed closed. Breezes coming in through open lab windows can adversely affect the proper functioning of the hood. Turbulence caused by these wind currents can easily bring the contaminated air inside the hood back into the laboratory.
•Safety devices such as deluge showers, eye wash stations, fire extinguishers, and fire blankets should be located convenient to the fume hood operating personnel.
•Fume hoods shall not have an on/off control accessible in the laboratory, unless the lab has an alternate exhaust ventilation system or the exhaust is being filtered through a charcoal or HEPA filter. Fume hoods are an integral part of the entire laboratory's air balancing system which must be maintained. Labs must be maintained under positive pressure and when a fume hood is turned off the lab can develop positive pressure.
Evaluation of new or refurbished laboratory fume hoods shall be performed by the installer prior to releasing the fume hoods for use. Tests shall be performed by qualified personnel to verify proper operation of the fume hoods.
Average face velocities shall be checked by RMS once per calendar year.
Verify that the building makeup air system is in operation, the doors and windows are in normal operating position, and that all other hoods and exhaust devices are operating at design conditions.
Check room conditions in front of the fume hood using a thermal anemometer to verify that the velocity of cross drafts does not exceed 20 percent of specified average fume face velocity. Any cross drafts that exceed these values shall be eliminated before proceeding with the fume hood test.
With the sash open 18 inches, measure the face velocity at nine different points across the fume hood face. Readings should be taken at equal distances across the face of the hood. Average air velocity at the hood face must be 80 to 150 linear feet per minute (fpm) with a minimum of 60 fpm at any measured point.
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