What is the internal structure of a fume hood like

The internal structure of a fume hood usually consists of the following main parts:

Shell: The visible part of the fume hood, used to control toxic and harmful gases and smoke. The shell materials are diverse, including all-steel, steel-wood, aluminum-wood, plastic-steel, PVC structure, etc. Modern fume hoods are mostly made of steel coated with epoxy resin.

Deflector plate: The deflector plate is located inside the fume hood and is used to ensure that the airflow passes evenly through the opening sliding door plane of the fume hood, thereby eliminating dead corners and optimizing capture efficiency. The design of the deflector plate can be adjusted according to the experimental requirements.

Sliding door: The sliding door of the fume hood. By adjusting the opening degree of the sliding door, the fume hood's ability and efficiency to capture toxic and harmful substances can be controlled. Each fume hood should be marked with the most suitable sliding door opening (working height). The materials of sliding doors are usually tempered glass or other safety glass, which have explosion-proof functions.

Air supply wing: Arranged along the worktable surface, it is used to ensure the stability of the airflow. Removing the make-up air wing may lead to the occurrence of turbulence and a decrease in capture efficiency.

Workbench surface: An area used for instruments and equipment, made of various materials, including solid core physical and chemical boards, stainless steel plates, PVC, ceramics, etc. It is required to be resistant to acids and alkalis, strong corrosion, high temperatures, and scratches. The countertop height is generally set at around 850 to 900mm, the opening height of the operation port is approximately 800mm, and the clear height inside the cabinet is usually no less than 1500mm.

Exhaust port: The outlet of the exhaust system of the fume hood, used to discharge harmful gases outdoors. The design of the exhaust port needs to ensure that the airflow passes smoothly and evenly through the sliding door surface of the fume hood.

Internal accessories: Depending on specific requirements, the interior of the fume hood may also be equipped with lighting equipment (such as fluorescent lamps), power sockets, faucets, etc., to facilitate experimental operations. These accessories are usually designed on the side walls or operation countertop of the fume hood, and corresponding protective measures are taken to prevent corrosion or short circuits.

Control system: Modern fume hoods are usually equipped with control systems to adjust parameters such as the exhaust volume and air velocity of the fume hood to meet the needs of different experiments. The control system may include components such as touch control panels and air volume regulating valves.

In addition, fume hoods may also be custom-designed according to specific needs, such as using special materials or adding explosion-proof functions. Structurally, a fume hood is typically divided into three parts: the upper cabinet (the fume hood itself), the middle operation counter, and the lower cabinet (the storage cabinet or the cabinet for the pipeline system).

Overall, the internal structure design of the fume hood aims to provide a safe and efficient experimental operation environment, ensuring the effective emission of harmful gases through reasonable air flow organization and control systems.