A fume hood is not a stand-alone piece of equipment. Changes in the external environment can affect the performance of the fume hood. At the same time, the fume hood and its control system will also affect his surroundings, the choice of fume hoods first of all take into account the factors of the whole system, such as laboratory space, the ventilation control system of the building, the arrangement of the exhaust piping and the placement of the fume hood, etc., and then you need to determine which type of fume hoods you need, the market is divided into three different styles of fume hoods: fume cupboards, desktop fume hoods, floor-standing fume hoods. The fume cupboards are described as follows. The fume hoods are described as follows:
Upper part of the cabinet
Whether the surface wind speed of the fume cupboard reaches the safe wind speed requirement stipulated by the international standard: 0.5m/s (the international standard stipulates that only when the surface wind speed reaches 0.5m/s can the harmful gases inside the cupboard be effectively captured).
Whether the opening height of the fume cupboard is suitable to meet your demand for operating space.
Ventilation control system: fixed air volume, variable air volume or adaptive control system.
Material of the inner lining: PP or special sheet, etc.
Whether the raw material of the adjustable door is made of safety glued glass, and whether its design is in accordance with human body mechanics, so that the operator can pull freely.
Table top
Whether the material of the table top meets your experimental needs to resist the corresponding erosion and high temperature.
Whether a cup holder or sink is installed, and whether it is installed in a reasonable position.
Whether the design of the air outlet is reasonable.
Base cabinet
Whether the material is strong and durable, whether it is fireproof, and whether it can resist the erosion of the acid and alkali environment in the laboratory.
Whether the power supply is reasonable and safe, whether it is easy to maintain the water, electricity and gas system, whether the bottom cabinet needs to be designed for pumping, so that you can place volatile drugs.
After basically choosing the model, style and size of the fume hood, you can determine what you need according to the following conditions.
Accessories
Water source: distilled, purified or reverse osmosis water, etc.
Gas source: nitrogen, oxygen or air, etc.
Electrical system: type, voltage, protection against violence, durability, etc.