The role of fume hoods


Shenzhen Jason Lab Equipment Co., Ltd. introduces us: the role of fume hood. Laboratory fume hoods are an integral part of laboratory planning. In order to prevent laboratory staff from inhaling or ingesting some toxic, pathogenic or unknown toxicity chemicals and organisms, the laboratory should have excellent ventilation.

To prevent the absorption of some vapours, gases and particulates (smoke, soot, dust and air suspensions), pollutants must be removed with a fume hood, fume hood or local ventilation. The structure of the fume hood is up and down, and there is an exhaust hole on the top, which can be installed with a fan. There are deflectors, circuit-controlled contact switches, power sockets, etc. in the upper cabinet. The see-through window is made of tempered glass, which can be moved left or right or up and down for operation. The lower cabinet adopts the experimental side table style, with a counter top and a cabinet body below. The table can be installed with small water cups and faucets.

The material of the fume hood consists of various types, such as all steel, steel wood, all wood, aluminum wood, plastic steel, PVC structure, etc., and its countertop is the place directly in contact with the operator. And other information. Old fume hoods were mostly made of wood, but modern ones are mostly made of epoxy-coated steel. Common cabinet widths are 1000, 1200, 1500, 1800, and 2000 mm. The standard is 700-900 mm deep and 1900-2400 mm high. Can be used by 1-3 people at the same time. Fume hoods are generally installed against a wall. The front center is a transparent door (mostly glass) that can be moved up and down, and the open height is generally 100-600 mm. Behind the door is the working surface for the experiment. There are connections for experimental needs such as water pipes, sewers, power supplies, vacuum pumps, gas pipelines, etc., and there are lamps with protective covers on them. After the air is sucked out by the exhaust fan in the front of the cabinet, or it is led elsewhere through the pipes (called full ventilation), or it is recirculated through filtering (becoming ductless ventilation).

Most fume hoods will send an alarm when the exhaust volume is too small or the square glass door is too wide to remind the operator to pay attention. The internal exhaust fan speed and lights are both adjustable. When using, people stand or sit in front of the cabinet, lower the glass door as far as possible, and reach into the cabinet for experiments with the hand under the door. Because the exhaust fan draws air inward through the open door, the harmful gas does not overflow a lot under normal circumstances.

Cabinet section: There are three styles: standard type, low table, floor type. Whether the external wind speed of the fume hood meets the safe wind speed requirement of the international standard rules: 0.5m / s (International standard rules: Only when the external wind speed reaches 0.5m / s can the harmful gases in the cabinet be captured effectively). Whether the height of the opening of the fume hood is suitable for your operation space. Ventilation control system: Constant air volume and variable air volume are still adaptive control systems. Lining board material: PP, fiberglass or polyethylene resin, etc. Whether the material of the adjusting door is made of safety glued glass, and whether its planning conforms to human mechanics, so that the operator can pull freely.

Countertop part: Whether the countertop has a safe dish plan, and then it is convenient for users to clean the countertop and prevent the leakage of toxic liquids. Whether the raw materials of the countertop meet the needs of your experiment and resist the corresponding corrosion and high temperature. Whether a cup or water tank is installed, and whether the installation orientation is reasonable. Whether the air outlet planning is reasonable.

Base cabinet part: whether the raw materials are sturdy and durable, whether it is fire prevention information, whether it can resist the corrosion of the laboratory's acid and alkali environment. Whether the power supply is reasonable and safe. Whether it is easy to maintain water, electricity and gas systems. Does the cabinet require a pump down plan so you can place volatile medicines. After you have basically selected the model, style and size of the fume hood, you can determine what you need based on the following conditions.

Accessories: Water Origin: distilled water, pure water or reverse osmosis water, etc. Gas origin: nitrogen, oxygen or air, etc. The selection of the electrical system must be considered: model, voltage, anti-riot, durability and so on. For aesthetic reasons, is it necessary to seal the board.

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