Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 224
disc fan varies greatlywith the type and the conditions under which it operates. The rated 182 HEATING AND VEXTILATIOX 173 capacities usually given in catalogues are for fans revolving in freeair—that is, mounted in an opening without being connected withducts or subjected to other frictional… … Fi<r. 149. Another Form of Propeller Fan, wltti Special Type of Blade. apply to fans working against a resistance such as would beproduced by connecting with a system of ducts of medium lengththrough which the air was drawn at a velocity not greater than 600or 800 feet per minute. Under these…
Architecture · Building · Carpentry
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