Dear all,
Can I please get some opinions on use of recirculating fume hoods?
We are looking at their potential use, primarily in undergraduate teaching. I’m sure we have all experienced the ‘hurricane’ effect from too many fume hoods in use.
Also the attractiveness of portability, environmental friendliness etc. that ‘ductless’ fume hoods seem to offer.
Here is an extract from our Australian/New Zealand Standard on these things:
AS/NZS 2243.9:2009 10
COPYRIGHT
2.2 LIMITATIONS OF USE
The recirculating fume cabinet shall not be used in the following circumstances (see also
Clauses 6.2, 6.6.2.3 and 6.6.2.4):
(a) For work with organic solvents which are only physically absorbed on the absorber
and the solvents -
(i) have boiling points less than 75=B0C; and
(ii) are evaporated in quantities of more than 50 mL per day.
NOTE: Fume from these organic solvents can be insufficiently delayed on the filter unless
chemisorption takes place, i.e. a chemical reaction between the absorbent and the solvent
fume.
(b) Where more than 50 mL of corrosive liquids are involved in a reaction or process that
generates fumes.
(c) Where perchloric acid digestions are carried out.
(d) Where other acid digestions are carried out except where these are conducted in
closed systems.
(e) Where infectious organisms are handled (see AS/NZS 2647 and AS 2252).
(f) Where Category 1 and Category 2 carcinogens (see NOHSC 1008), except those
which are chemisorbed by the filter, are used.
(g) Where radioactive materials exceeding ten times the annual limit of intake for
inhalation* are used.
(h) Where temperature and humidity extremes can affect filter operation.
However I don’t need to tell you guys that standards are not law.
Thanks in advance, Paul
____________________________________________
Paul Dover
Phone: +61 3 9903 9551
Email: Paul.Dover**At_Symbol_Here**pharm.monash.edu.au
Resources Manager
Medicinal Chemistry and Drug Action
Monash Institute of Pharmaceutical Sciences
Monash University (Parkville Campus)
381 Royal Parade, Parkville
Victoria, 3052. Australia
Fax: +61 3 9903 9143
Web: http://www.pharm.monash.edu.au
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