Fume Hoods

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Fume Hoods

Ductless fume hoods are useful where it is not necessary or practical to have a ducted fume hood. They also have the benefit of being portable so can be moved to other locations as required. They have a choice of sizes and filters depending on the gas or particulates being removed. The filters can be easily changed when expired or to another type when working with another gas, etc. They take only 20-30 minutes to assemble.

 

Call... Enquire...
Call Progen Scientific to discuss your requirements on 020 85422283 Click here to make an enquiry online about fume hoods.

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Progen Scientific can supply the CRUMA portable fume hoods designed in compliance with the standards: BS 7258, EN ISO 9001:2000, AFNOR NF X 15-211 (Class II), CSA Z 316.5, EN-1822, EN-779 and EN-141.

They also have a 5 year guarantee.

How are the gases filtered?

The molecules of the gas to be filtered are removed from the gaseous effluent by retention in a solid medium. This phenomenon of separation is known as "adsorption" and is used to filter the gases inside the fume hoods. The process uses activated carbon filters impregnated with different substances depending on the molecules to be adsorbed.

There are two adsorption mechanisms: "chemisorption" which retains molecules by chemical bonding with the carbon surface and "physiosorption" which involves an electrical interaction (Van der Waals forces) between the molecules and the adsorbent material. Although chemisorption ensures bonds that are 20 times stronger, both mechanisms are equally important in the global process of adsorption.

Filtration of solids and aerosols

Fume hoods enable the filtration of solids to be removed from a gaseous effluent whereas filtration of aerosols eliminates droplets or small particles of liquid molecules from the carrier gas.

CRUMA fume hoods operate efficiently in both cases as they are fitted with HEPA (High Efficiency Particulate Air) absolute filters (Class H-14 highest efficiency of 99.995% in accordance with EN-1822 standard).

 

Call... Enquire...
Call Progen Scientific to discuss your requirements on 020 85422283 Click here to make an enquiry online about fume hoods.

 
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