fume hood

1laboratoryfume hoodIntroduction:

Laboratory ventilation is an integral part of laboratory design. In order to prevent laboratory staff from inhaling or swallowing toxic, disease causing, or unknown toxic chemicals and organisms, there should be good ventilation in the laboratory. To prevent the absorption of some vapors, gases, and particles (smoke, soot, dust, and aerosols), pollutants must be usedfume hoodRemove the ventilation hood or local ventilation method.

fume hoodIt is a commonly used local exhaust equipment in laboratories, with a wide variety of types. Due to its different structures and usage conditions, its exhaust effect varies.fume hoodThe structure is top and bottom, with exhaust holes at the top that can accommodate fans. There are deflectors, circuit control touch switches, power sockets, etc. in the upper cabinet. The perspective window is made of tempered glass and can be moved left, right, or up and down. For human operation. The lower cabinet adopts an experimental edge table style, with a tabletop on top and a cabinet below. The countertop can be equipped with small water cups.

fume hoodThe materials used are various, including all steel, steel wood, all wood, aluminum wood, plastic steel, PVC structure, etc. The tabletop is in direct contact with the operator and is made of solid core physical and chemical plates, stainless steel plates, etc, PVC， Composed of materials such as ceramics.

IIlaboratoryfume hoodThere are two categories:

1. Classified by exhaust method:

It is divided into three types: upper exhaust type, lower exhaust type, and simultaneous upper and lower exhaust type. To ensure uniform wind speed in the workspace, for cold processesfume hoodLower exhaust type should be used for the thermal processfume hoodAdopting an upper exhaust system, for processes with unstable heat generation, exhaust ports can be set up both above and below to adjust the ratio of the upper and lower exhaust air volumes according to the changes in heat generation inside the cabinet, thereby achieving uniform wind speed.

2. Classified by air intake method:

Fully exhaust typefume hoodThe method of circulating indoor air inside the cabinet and then discharging it outside is called full exhaust, which is a widely used type.

Supplementary air typefume hoodWhen:fume hoodWhen set in rooms with heating or temperature and humidity control requirements, in order to save heating and air conditioning energy consumption, the method of taking supply air from the outside and circulating it in the cabinet before discharging it outdoors is called air supply typefume hood.

Variable air volume typefume hoodA regular constant air volume system requires manual adjustment of the fixed blade air valvefume hoodWhen adjusting the valve to a certain angle, achieve the desired surface air velocity. Variable air volume control is achieved by adjusting the sensor of the valve to change the air volume to a given surface wind speed. Of course, standard methods have low costs and variable air volume costs are high, making them suitable for high-precision applications.