A fume hood is typically a large piece of equipment enclosing five sides of a work area, the bottom of which is most commonly located at a standing work height.Two main types exist, ducted and recirculating (ductless). The principle is the same for both types: air is drawn in from the front (open) side of the cabinet, and either expelled outside the building or made safe through filtration and fed back into the room. This is used to:
*Protect the user from inhaling toxic gases (fume hoods, biosafety cabinets, glove boxes)
*Protect the product or experiment (biosafety cabinets, glove boxes)
*Protect the environment (recirculating fume hoods, certain biosafety cabinets, and any other type when fitted with appropriate filters in the exhaust airstream)
Worktop: Phenolic Resin
Surfaces made of cost effective High Pressure Phenolic Resin composite are resistant to chemical stain and corrosion. Non-porous and non-conductive, its strong durable qualities enable it to withstand high impact and shock. It is easily cleaned with soap and warm water.
Worktop: Epoxy Resin
Because of the natural resistance to corrosion, the industry has found it superior to any other top material for laboratory work. It is resistant to most organic and inorganic chemicals and is non-toxic. In addition, it is resistant to mechanical and thermal shock.
Variable air volume vs. constant air volume?
• Constant volume is good for small applications, for dedicated exhaust, or for two to four units sharing an exhaust.
• Most hoods have “setup” time and “run” time, or are only used on a limited basis. While slightly more expensive to buy, that makes a two-speed exhaust more cost effective in use. Typically, low speed is 50% of high speed. Set the blower on high for setup, low for runtime, or for limited-use purposes.
• Hoods should be in close proximity to one another to save money on installing and maintaining the exhaust system.
• You can also plan for future hoods to be added to the system. But make sure future expansion is identified in the building plan, so that the whole building exhaust and supply can accommodate future needs. For example, you can buy a blower for a 4-hood system when youre only planning to install two hoods at first. Then just block off your “future” duct until you buy the additional hoods.
Cold-Rolled Steel (Painted) benchtop fume hoods
|Type||Benchtop fume hoods|
|Exhaust system||CAV exhaust system (Constant air volume)|
|Exhaust fan||Inclined flow fan (The installation principle is the same as air conditioning)|
|Exhaust air rate||1500-3500m3/h|
|Ventilation ducts||(φ250 or 315mm)PVC material, FPR, PP or other|
|Power||(Single-phase) 220V/50HZ or (Three-phase) 380V/50HZ|
|Air valve||Manual or electric|
|Average wind speed||0.3-0.6m/s adjustalbe|
|Noise level||< 60dB(A)|
|Tops||12.7/16/19/mm thickness of Phenolic resin (Other: Epoxy resin, Ceramic etc)|
|Inner Liner||Using HPL physiochemical board to make for lining plate and the flow guide plate|
1.0mm thick cold-rolled steel with 75μm epoxy resin powder coating, most chemical resistant
1200/1500/1800*850*2350 mm (customizable)
Transparent tempered glass, explosion-proof (manual sliding)
|Opening height||20-700 mm|
Touch, intelligent control panel (can control lights, sockets, exhaust fan etc)
|Gross weight||280-400 kg|
|Lab accessories||Pegboard, sink, faucet, gas fitting, sockets, lab stools etc|