Abstract
THE necessity for air-raid precautions and for black-outs has introduced several problems besides that of lighting which have to be studied. In the Electrician of October 11 a discussion is given of some important considerations with respect to electric fan ventilation. One attendant result of most of the measures taken for black-out and sandbagging against the effect of bombing is the restriction of the natural air-flow and an increase in the heat dissipation due to augmented lighting. Since it is known that a relatively high proportion of carbon dioxide can be permitted without any ill-effects, in big ventilation systems a large percentage of the air is recirculated in order to conserve the heat. Hence where the volume of air relative to the number of persons concerned is large, an air disturber serves a useful purpose in both summer and winter. In smaller places the most usual method of ventilation under ordinary peace conditions is by exhaust, but it is now common to take into consideration the presence of gas from enemy action, and for such eventualities it is necessary to take in a supply of clean air by means of an intake placed so as to be above the level likely to be contaminated. Complete protection is afforded by first passing the air through a filter.
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Electric Fan Ventilation. Nature 146, 616 (1940). https://doi.org/10.1038/146616a0
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DOI: https://doi.org/10.1038/146616a0