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Manufacturers normally test their fume hoods without chemicals or laboratory equipment inside the hood (except for the tracer gas ejector). In actual use, a fume hood is likely to contain all sorts of apparatus and equipment, including: support racks, beakers, hoses, heaters, chemical containers,analyzers, etc.
Some items may be quite large and positioned in a way that adversely affects the internal airflow pattern that is necessary for optimum fume containment. Experiments or chemical processes may give off substantially greater amounts of fumes than the quantity of tracer gas used in the ASHRAE 110 test.
Also, the actual chemical fumes generated may be of much different buoyancy than sulfur hexafluoride tracer gas and, therefore, behave differently. Heaters and electrical equipment within a fume hood's interior generate convection air currents. All of these factors-either individually or combined-usually have an adverse effect on fume containment especially in comparison to a nearly empty fume hood tested under optimum room conditions.
| 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) | |||
For many years, fume hood manufacturers, laboratory safety standards1and safety professionals have maintained that a face velocity of about 100 fpm was generally required for adequate fume containment and thus safe fume hood use.
More recently, many experienced and renowned fume hood safety professionals have stated that having the recommended fume hood face velocity is no guarantee that a given fume hood will provide adequate fume containment and user safety. And, newer editions of laboratory safety standards contain extensive warnings against using face velocity as the sole criteria for safe fume hood. Individuals who have wide-ranging experience in fume hood containment testing, especially with the ASHRAE 110 tracer gas test, will frequently cite their own test results as evidence against equating adequate face velocity with adequate fume containment.
Face velocity is the average amount of air that is pulled through the face of a hood. If these velocities are too low then chemical fumes can escape the hood and go back into the lab. If the velocities are too high, energy costs will be high as you exhaust large amounts of conditioned air from the room. In other words, if too much air is being pulled into the machine (high volumetric flow) it becomes extremely inefficient. If too little air is being pulled into the machine (low volumetric flow), then it can be dangerous for those around the equipment. Airspeed is everything when discussing face velocity. Today we are going to discuss fume hood face velocity requirements, so you can keep your equipment safe and efficient.
• 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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