During the autumnal hay fever season of August and September 1932, further studies were carried on to determine the effects of filtered air on patients suffering from autumnal hay fever and hay asthma.1
In this experiment the air for the eight bed ward was filtered by two special machines manufactured by the American Air Filter Company. In accordance with the suggestions made as a result of our experience last year, two filters were installed in each machine through which the air passed in series. Each of these filters had an effective filtration surface of 226/10 square feet. Four ply cellulose filters were used with the exception of a short time when Eastman cloth, a woven cotton material, was substituted. The Sirocco type blower was used for moving the air. When the filters were clean, each machine had an approximate capacity of 800 cubic feet per minute. The machines were
NELSON T, RAPPAPORT BZ, WELKER WH. THE EFFECT OF AIR FILTRATION IN HAY FEVER AND POLLEN ASTHMAFURTHER STUDIES. JAMA. 1933;100(18):1385–1392. doi:10.1001/jama.1933.02740180007003
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