In the laboratory construction, select the ventilation cabinet and determine the installation position of the fume hood. It is necessary to select the type, material, shape and so on of the ventilation cabinet according to the experimental content.
Drugs used: when using organic or other special reagents, take full account of the control of wind speed. Heat source: when using a device with a heat source, when the heat exceeds 2000 kcal / h, the amount of ventilation required to exhaust the heat is considered so as to determine the power of the fan. There are radioactive substances or perchloric acid experiment: to select a dedicated ventilation cabinet, its inlet wind speed must be set greater than 0.5m/s. Experiments with large equipment take into account the effective size of the interior, leaving the necessary space for ventilation.
Material: in the use of special acids experiment, we should consider the material of the ventilation cabinet, such as semiconductor industry, corrosion industry, etc., must be made of corrosion-resistant materials.
Size: according to the experimental content, select its size, size is too large, resulting in waste, too small to use.
Environmental protection: the discharge of harmful gases must be lower than the national environmental protection requirements, if more than the national health standards, should be installed corresponding purification device.
Save energy: try to save energy. In heating or air conditioning room, use air filled ventilation box or choose ventilation cabinet with air volume control. When choosing a ventilator, it is also necessary to determine its power according to its needs. It is not appropriate to increase the exhaust air volume and pressure blindly, and the power consumption of the inverter or variable speed fan can be reduced.
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