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Specific chemical workflows have propelled design changes in cabinet size, shape, materials, and integrated equipment. The most familiar and ubiquitous designs are the general purpose standing or benchtop ducted hood, which exhausts vapors outside through building HVAC; and the portable filtered hood, with efficient molecular filters that release clean air back into the laboratory.
There are several other specialized types, however, each with their own associated materials and components. Distillation and floor-mounted hoods, common in pharmaceutical formulation assays, contain tall interior cabinet spaces for large equipment, often with walk-in capacity, although the user should always stay out.
Acid digestion hoods are often employed by investigators to identify elemental compositions of alloys, and their cabinets usually contain polyvinyl chloride liners instead of fiberglass or steel, to avoid acid etching.
Radioisotope hoods contain built-in lead shielding, and seamless corners to allow for thorough reagent clean-up and appropriate disposal. There is, finally, a specific hood design just for work with perchloric acid, which attenuates sparking and friction to mitigate explosion risks, and contains acid-resistant liners, with an integrated washdown system.
| 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) | |||
How do you know whether the working face velocity is adequate to sequester vapors away from you? The first line of defense is to strictly adhere to regular re-certification paradigms scheduled through chemical safety officers. This will ensure that the hood performs to its standards, and extend its longevity. For daily use, however, an external monitor is an integral element in a new hood system, or a key upgrade in an existing system.
Contemporary monitoring devices can function via sidewall sensors that measure flow-through of clean ambient air, and inline or probe sensors that detect velocity within ducting for exhaust air leaving the hood. Alarms notify users when face or duct velocities are compromised, via visual, auditory, and remote app-based notifications. Parameters and thresholds can be changed via touchscreens sensitive to gloved fingers, and performance data can be recorded and analyzed in compliance both with ANSI/NFPA standards, and with GLP/GMP guidelines
As a best practice, the lower the sash handle is, the safer the user will be. Hoods should never be used at full open-this is for setup only. Working with an 18-inch opening on a vertical sash is far safer than working at full open.
When you stand in front of the sash opening, your body acts like an airplane wing; the air being drawn into the hood flows over your shoulders and around your sides, creating a low-pressure zone directly in front of you. This low-pressure area in front of you will attempt to pull air from inside the hood outward, creating a loss of containment and possible exposure. This is why you always work at least six inches behind the sash to keep chemicals out of the area of reverse flow.
Next, extend your hands and arms into the hood and move them about. What are they doing to the airflow? Picture yourself in a canoe, your arms are the paddles, and just as the paddles can displace large amounts of water, your arms can displace large amounts of air creating turbulence and disrupting the airflow. This is a recipe for loss of containment. When working in the hood, move your hands and arms slowly and deliberately.
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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