Illustrations of the theory and practice of ventilation : with remarks on warming, exclusive lighting, and the communication of sound (1844)
Reid, D. B. (David Boswell), 1805-1863 · London : Longman, Brown, Green, & Longmans · leaf 133
108 VENTILATION BY FANNER. 220. If it be required to lead air into the centre of the fan-ner for any special purpose, the external casing should be madeair-tight, so that no air can pass to the centre except by thecourse indicated by the arrows, and being discharged subse-quently at the opposite… … LUL Ml 221. In all the forms of the fanner, it will be observed, thatit receives air at the centre and discharges it at the circum-ference. Fanners are made of all sizes, from the little blowerused according to Mr Clarkes patent for household fires, to thelarge and powerful instruments such as…
