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Similar to the face velocity at the plane of the sash, a safe hood must maintain a threshold duct velocity to adequately move vapors out of the hood and propel them through building systems to the outside. This necessitates a symbiosis between hood capacity, blower size, and ducting layout to optimize the airflow appropriate for the size and type of hood. A weak blower exhausting a large cabinet will not sufficiently expel vapors, while a powerful blower can potentially overwhelm the duct system and create turbulence within the cabinet airflow, compromising both face and duct velocities.
In all possible iterations of fume hoods and associated componentry, the litany of codes and standards that independently govern each part can be overwhelming. However, as Fulmer explains, the ANSI Z9.5 Standard for Laboratory Ventilation, which is comprehensive, is however "superseded by any local building codes." Depending on the needs of the investigator, and the capacity of the building, the appropriate fume hood option is always available.
| 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 are typically used in laboratories to collect and exhaust fumes. The cross-section of a hood below has a vertical sash which can be raised and lowered as necessary. The horizontal air velocity into the hood is, typically, maintained at a constant velocity of 80-100 fpm whatever the sash height.
When the hoods are not operating, the room control is much the same as a normal occupancy for a variable air volume controlled room. When the hoods are operating, the control system senses the flows and pressures in the room, hoods, and ducts in and out, and makes adjustments to maintain the temperature, humidity, and pressurization of the room. The objectives for control in laboratory hoods are for the capture and containment of fumes and harmful gases, to maintain acceptable room pressurization, to maintain acceptable temperature and humidity set points, and to ventilate the space in order to preserve dilution of contaminants.
Many conditions can affect performance and speed of response from the control system. There are great cost differences between desired levels of control for these systems; the designer needs to know and account for the accuracy and reliability of controls required for the process.
• 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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