Conventional Fume Hood
All laboratory hoods work
on a very basic principle of containment. Negative pressure relative
to the exterior is maintained within
the interior of the hood to prevent any toxic vapours from
escaping and air is drawn at a consistent rate into the hood opening.
Experimental procedures are performed within the hood which is
consistently
and safely ventilated, usually by means of an extract blower
and
ductwork.
Ductless Fume Cabinet
Conventional ducted fume
hoods provide safety to laboratory personnel by drawing air across
a front opening in the hood at a controlled
rate, thus preventing any toxic vapours generated during the
experimental procedure from escapng into the general laboratory
environment.
