Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 231
greater quietness of action.This is due both to the slower speed of the motor and to the absenceof belts. Sufficient speed regulation can be obtained with direct-connectedmachines, without excessive waste of energy, by the use of a rheostat. If a direct current is not available, and an alternating… … Fig. 154. Horizontal Engine foi* Fan Use. Area of Ducts and Flues. With the blower type of fan, the sizeof the main ducts may be based on a velocity of 1,200 to 1,500 feet perminute; the branches, on a velocity of 1,000 to 1,200 feet per minute,and as low as 600 to 800 feet when the pipes are…
Architecture · Building · Carpentry
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