Laboratory fume hoods are partially enclosed workspaces that are exhausted to the outside. Their primary purpose is to keep toxic or irritating vapors out of the general laboratory working area. A secondary purpose is to serve as a shield between the worker and the equipment being used when there is the possibility of an explosive reaction, or to protect the specimen.
Laboratory fume hoods are comprised of the hood itself and a sash, which is the front panel of the fume hood...
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Q & A on Fume Hoods
We asked our users for their input on Fume Hoods. Here are the results of 121 users familiar with Fume Hoods.Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice
Who Took Our Poll?Top
Low-flow designs for certain applications, with blowers inducing room air at the top of the sash, enabling near-laminar flow to the back of the hood, versus the traditional "roil" of air. No more Reynold's Numbers...
Variable-air volume electronic fan controls, PID sensor integration for organic chemical use, BACNET-capable electronics
Ecosash Automatic Sash Closing System that we have recently released to the Australian and New Zealand markets.
Applications and UseTop
Multiple acid digestion of metallurgical samples, fusion of metallurgical samples, handling of volatile organic solvents.
Using carbon steel interior hoods for acid digestion applications. The hood will only last a year or two.
Using filters on intake of hood and lack of maintenance may lead to fire.
Readily available information from fume hood manufacturers on the types and quantities of filtration offered in the fume hood. While many manufacturers offer a chemical gas filter, almost none specify the quantity of filtration media in the filter as well as the depth of the filter bed. These parameters are critical if one is to ensure that chemical vapors are indeed filtered by the system.
Wider fume hoods with more than 1 sash along the width of the fume hood. Better light fixtures, Hoods with a side slit to allow for organized entry of cords, tubes etc. Detachable front ends (do not know the word) ie, make it easier to sweep out a hood.
Lowest operating cost, most energy efficient fume hood. Robust containment. High sight line.
Many solvent gases are heavier than air and will not move upward through the fume hood. These gases will drift outward and into the ambient air. Such gases may include xylene and gluteraldehyde.
Do not select a fume hood that is oversized for your application, or you will unnecessarily increase your energy costs.
Be sure to correctly match type of hood with the prospective use of the hood. One size does not fit all.
It is very helpful for work if the motor is sound proof.