Fume Extraction and Dispersal

Abstract

As we have seen, protective air enclosures are mostly used for protection against hazardous materials being inhaled by operatives, and in all these applications the advantages obtained from carefully trapping the dangerous materials into a confined air stream are of doubtful value if that air stream is not extracted and dispersed so that it cannot be driven back into the laboratory itself, cannot reenter the hospital at any point and cannot disperse in a manner that would contaminate adjacent buildings. We have seen in chapter 6 how a number of ancillaries to air enclosures should be considered to assist in developing a satisfactory direct extraction. Problems now arise relating to how to engineer a complete ducting and dispersal system from the enclosure to a point where it is sufficiently dispersed so as to cause no harm.