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Ventilation devices are used to capture and remove the contaminants (gas, vapour, or dust) away from the users and out of the laboratory. Fume hood (fume cupboard or fume closet) is a local ventilation device found in all laboratories.
Fume hoods control contamination by drawing air through the face of the fume hood and away from the users and labs. Through ventilation fume hoods minimise the risk of contamination.
SASH is a moveable panel on front portion of the fume hoods - often referred to as the fume hood door or window. Sash provides a protective barrier between the lab user and the experiment. The common sash configurations are - vertical, horizontal, and combination sash (vertical + horizontal).
BAFFLE is the slotted openings along the back of the hood. Baffles work in tandem with the sash to control the air flow in the fume hood and keep the airflow uniform. By eliminating the dead spots and reverse airflow (into the labs), baffles play an important role in safety and fume hood efficiency. In older fume hoods, baffles were moveable partitions, but modern fume hood comes with fixed baffles.
BODY comprises the fume hood exterior and the interior. The fume hood body contains the contaminants. Well-designed exterior will have a contoured entry (aerodynamic design) to assist airflow into the hood and improve hood performance. The material of construction (MOC) is an important consideration for fume hood, specifically the interior liner material. Since chemicals and gases can corrode the interiors and exterior, MOCs resistant to work being conducted in the fume hood is critical when selecting your fume hood.
| 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) | |||
The five important aspects you need to check for when selecting your next fume hood are:
1. SAFETY
Safety of the fume hood can leave you in a twist. There are many aspects affecting the safety - fume hood design, material of construction, sash positions, exhaust efficiency, user-friendly features, etc. Many accredited bodies (SEFA, ASHRAE, Underwriters Laboratories, National Fire Protection Association, etc.) are working hard to specify the safety and quality standards.
2. ECONOMICS
According to a research, a lab consumes 5 times the energy as an equivalent office space. As the environmental norms are tightening and organisations are becoming conscious of their energy consumption, fume hoods can play a significant part in reducing the energy bills and carbon footprint. Fume hood exhaust requirements affect the total cost of energy - the cost of heating and cooling the air exhausted by the hood.
3. SIZE
Fume hood must be large enough to accommodate the containers and apparatus within the prescribed safe work area of the hood (6″ behind the plane of the sash). The configuration of the hood should allow containers movement in and out of the hood with ease.
4. NON-CORROSIVE
The interior of the hood must resist the corrosive effects of chemical fumes, vapors, and condensation particulates. Fume hood designs preventing contaminants collection and deposit on the interior surface should be high on your agenda for safety and higher ROI.
5. CONVENIENCE
Modern fume hoods allow for convenience of users besides safety. What may seem a minor aspect can affect the lab environment.
• 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.Why do fume hoods use so much energy?
It's the air being sucked through the fume hood, not the fume hood itself that consumes so much energy. For health and safety reasons, labs use 100% outside air which must be heated or cooled for comfort before it is brought into the lab. In addition to the energy required to condition the air, a significant amount of additional electricity is required to run large fans to move the air through the building and through the fume hoods.
How does shutting the sash save energy?
Most fume hoods at Stanford are variable air volume (VAV), meaning that the fume hoods are designed to vary the air flow based on how wide open the sash height is. Sash position is connected to the building's ventilation system so that a building's fan speed and the volume of air moved is reduced when the sash is lowered.
Is it safe to shut the sash?
The sash is an important safety barrier between the fume hood interior and the laboratory, protecting the lab user. Sashes should be opened only to set up or modify an experiment. At all other times, shutting the sash is safest. When the sash is shut there is still some air flow through the hood to remove any fumes.
How do I remind myself and my roommates to close the sash?
You can post a sticker, like the one shown in the picture below, to remind yourself and your lab mates to close the sash when not in use. The sticker also educates new fume hood users tha a lower sash is safer, and that the sash should only be open when setting up and modifying experiments.
What other fume hood practices can reduce my energy consumption?
• Never use a fume hood just for storing chemicals - they belong in a safety cabinet, which doesn't require huge volumes of air.
• If your fume hood has an occupancy switch, turn it off when not in use.
• If your group is no longer using a specific fume hood, consider having it locked and de-commissioned so air no longer flows through it.
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