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The difference between fume hood and laminar flow cabinet 2/2

3、 Structural characteristics
FUME HOOD
Shell: Generally made of metal material (such as stainless steel) or plastic material, it has good corrosion resistance and strength, and can withstand the chemical erosion and pressure that may occur during the experimental process.
Work area: The internal space is large, making it convenient for various experimental operations. The workbench is usually made of corrosion-resistant and easy to clean materials, such as epoxy resin boards.
Deflectors and orifice plates: deflectors are used to guide the flow of air, making the airflow more evenly distributed in the working area; Orifice plates help improve airflow conditions and enhance exhaust efficiency.
Filters (partially available): Some fume hoods may be equipped with filters to further purify the exhaust gas and reduce environmental pollution. The type of filter is selected according to the type of substance that needs to be filtered, such as activated carbon filters that can be used to adsorb organic gases.
Fan and exhaust system: The fan is one of the core components of the fume hood, providing the power for exhaust. The exhaust duct connects the fume hood to the outside to ensure smooth gas discharge.
Ultra clean workbench
Shell: Also made of metal or plastic material, with a smooth surface that is easy to clean and disinfect, preventing bacterial growth.
Filter: High efficiency filters are key components of ultra clean workbenches, with a filtration efficiency typically exceeding 99.99%, capable of effectively intercepting small particles and microorganisms. The filter is installed at the end of the air supply system to ensure that the air entering the work area is clean.
Fan and air supply system: The fan delivers filtered air into the work area at an appropriate speed, and the design and layout of the air supply system should ensure uniform distribution and stable flow rate of the air.
Workbench: Typically a flat, smooth, and easy to clean surface, such as a stainless steel countertop. Some ultra clean workbench surfaces also have antibacterial properties, further reducing the risk of contamination.
Lighting system: In order to ensure sufficient light in the work area, the ultra clean workbench is equipped with lighting devices, usually using fluorescent or LED lights, to provide a bright and uniform lighting environment.
4、 Operation precautions
FUME HOOD
Before the experiment, check whether the power supply, fan, exhaust system, etc. of the fume hood are working properly to ensure that the fume hood is in good operating condition.
When operating, try to concentrate the experimental equipment and operating area in the working area of the fume hood, and avoid operating outside the fume hood that may produce harmful gases.
Do not place too many items inside the fume hood to avoid affecting the normal flow of air. At the same time, ensure that the exhaust outlet of the fume hood is unobstructed.
After the experiment, the fume hood should be allowed to continue running for a period of time (usually 5-10 minutes) to ensure that any residual gases generated during the experiment are completely expelled.
clean bench
Before use, turn on the fan of the ultra clean workbench and preheat it for a period of time (usually 20-30 minutes) to achieve a stable clean state in the work area.
When operating, keep the work area clean and avoid stacking too many unnecessary items on the workbench. All experimental supplies should be cleaned and disinfected in advance.
Operators should wear clean work clothes in front of the ultra clean workbench, avoiding exposure of hair, skin, etc., and preventing contamination of the work area by microorganisms carried by themselves.
After the experiment, turn off the power of the ultra clean workbench, clean the workbench, wipe it with disinfectant, and regularly replace the filter to ensure the cleanliness of the equipment.

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