Audited Supplier
A chemical hood can be used for storage of volatile, flammable, or odiferous materials when an appropriate storage cabinet is not available. While it is appropriate to keep chemicals that are being used during a particular experiment inside the chemical hood, hoods are not designed for permanent chemical storage. Each item placed on the work surface interferes with the directional airflow, causing turbulence and eddy currents that allow contaminants to be drawn out of the hood. Even with highly volatile materials, as long as a container is properly capped evaporation will not add significantly to worker exposures. Unlike a chemical hood, flammable materials storage cabinets provide additional protection in the event of a fire.
When working with highly hazardous materials, the higher the face velocity the better. While it is important to have a face velocity between 0.3 m/s (60 fpm) and 0.5 m/s (100 fpm), velocities higher than this are actually harmful. When face velocity exceeds 0.6 m/s (125 fpm) eddy currents are created which allow contaminants to be drawn out of the hood, increasing worker exposures. Check with local safety regulations on the maximum face velocity before using the hood.
The airfoil on the front of a hood is of minor importance. It can safely be removed if it interferes with my experimental apparatus.
Airfoils are critical to efficient operation of a chemical hood. With the sash open an airfoil smoothes flow over the hood edges. Without an airfoil eddy currents form, causing contaminates to be drawn out of the hood. With the sash closed, the opening beneath the bottom airfoil provides for a source of exhaust air.
| 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) | |||
UniFlow Superstructure exclusive unitized dual wall construction for superior chemical resistance, strength, and durability. 1 piece interior fume chamber to be glass-smooth with VaraFlow baffle system & bell shaped exhaust collar.
Access Panel removable to access ducting connections and electrical services from a single point electrical box, 115V/60Hz AC operation.
Sash is perfectly counter balanced, 3/16 tempered safety glass, coated stainless steel cable with stainless steel pulley assembly. Framed in nonmetallic PVC framing, track, and aerodynamic sash lift for ease of movement and air flow efficiency.
Plumbing Services are color coded to specific service.
Fume Hood Fire Extinguisher optional feature.
Epoxy Work Surfaces optional feature.
Fume Hood Base Cabinet optional feature.
Sash Stop located at 1/2 open position to reduce air flow 50%.
Air Flow Monitor continuously monitors face velocity air flow, comes standard with analog, digital available.
Do Not store chemicals, equipment, or other materials in hoods . Unnecessary storage increases the chances of a small fire or explosion and decreases the required air flow.
• Keep sash below the mark on the hood frame for achieving the best face velocity and close it when the hood is not being used.
• The hood should be kept closed, except during apparatus set-up or when working within the hood is necessary. Keep the sash closed when not in use to
maximize energy conservation.
• If the alarm activates, lower the sash a little until the alarm stops - Do Not disengage or over-ride the alarm.
• If any hazardous material is spilled or splashed inside the hood be sure to clean it up right away. Leave the hood surfaces clean.
• Care should be taken with the use of paper products, aluminum foil, and other lightweight materials within a hood. For example, a single paper towel or chemical wipe can potentially decrease the airflow into the hood if it restricts exhaust flow.
• Do not place electrical receptacles or other spark sources inside the hood when flammable liquids or gases are present. No permanent electrical receptacles are permitted in the hood.
• Should the fume hood malfunction in the middle of a procedure that releases hazardous fumes, mists, or particulates, follow this emergency plan:
-Terminate all electrical and gas supply.
- Pull the sash all the way down to the close position .
- Alert supervisor and neighboring labs, advising everyone to evacuate the area.
- Post "DO NOT ENTER, HAZARDOUS FUMES" on the entrance door if doing so will not compromise your safety
• 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.
• Fume hoods should be certified, at least annually, to ensure they are operating safely. Typical tests include face velocity measurements, smoke tests and tracer gas containment. Tracer gas containment tests are especially crucial, as studies have shown that face velocity is not a good predictor of fume hood leakage.
• Laboratory fume hoods are one of the most important used and abused hazard control devices. We should understand that the combined use of safety glasses, protective gloves, laboratory smocks, good safety practices, and laboratory fume hoods are very important elements in protecting us from a potentially hazardous exposure.
• Laboratory fume hoods only protect users when they are used properly and are working correctly. A fume hood is designed to protect the user and room occupants from exposure to vapors, aerosols, toxic materials, odorous, and other harmful substances. A secondary purpose is to serve as a protective shield when working with potentially explosive or highly reactive materials. This is accomplished by lowering the hood sash.
