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Document ID (ISN)34785
CIS number 81-84
ISSN - Serial title 0003-4878 - Annals of Occupational Hygiene
Year 1980
Convention or series no.
Author(s) Robertson P., Bailey P.V.
Title Suggested improvements to prevent the escape of fume from beneath the sash of a fume cupboard.
Bibliographic information 1980, Vol.23, No.3, p.305-309. Illus. 3 ref.
Abstract Problems described are: a stable vortex of contaminated air remains behind the partly opened sash; the handle of the sash creates a second, smaller vortex partly outside the cupboard; external disturbances of airflow may result from movements in the laboratory (studies of a person walking in front of the fume cupboard are described); air can escape from the cupboard when objects are removed from it. Improvements described are: modification of the bottom edge of the sash with a horizontal plate; provision of a "bellmouth" entrance below the sash; use of a turning vane. Using the vane and a face velocity of 0.5m/s it was very difficult to cause smoke to escape from the cupboard.
Descriptors (primary) exhaust hoods; toxic gases; aerodynamics
Descriptors (secondary) description of technique; ventilation design
Document type D - Periodical articles
Subject(s) Heating, ventilation and climate
Broad subject area(s)
Browse category(ies) Ventilation