Handbook for heating and ventilating engineers . Fig. Fig. 89. Fan housings are made in many different styles, andof various materials, the more readily to fit any given set ofconditions. Materials employed may be of brick, wood, sheetsteel or combinations of these. Steel housings are the mostcommon and are made in such a variety of patterns aswill fit any requirement of plenum duct direction. Whatare known as full housings are those in which the entire fanwheel is encased with steel and the entire unit is self-con-tained and above the floor line. Three-quarter housings arethose in which only
Handbook for heating and ventilating engineers . Fig. Fig. 89. Fan housings are made in many different styles, andof various materials, the more readily to fit any given set ofconditions. Materials employed may be of brick, wood, sheetsteel or combinations of these. Steel housings are the mostcommon and are made in such a variety of patterns aswill fit any requirement of plenum duct direction. Whatare known as full housings are those in which the entire fanwheel is encased with steel and the entire unit is self-con-tained and above the floor line. Three-quarter housings arethose in which only the upper three-fourths of the fan wheelIs encased, the completion of the air-sweep around the 158 HEATING AND VENTILATION paddles being obtained by properly forming the brick foun-dation upon which the fan is installed. The larger fansare commonly three-quarter housed, especially if they areto deliver air directly into underground ducts. Fig. 88shows a full housing and Fig. 90 a three-quarter
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectventila, bookyear1913
