Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 252
used in case of large volumes of air,is to provide a number of light cloth bags of considerable length,through which the air is drawn before reaching the heater. These arefastened to a suitable frame or partition for holding them open. Thegreat objection to filters of this kind is their obstruction… … -JKhp^innahrt^ X s. An apparatus which iscoming quite generally intouse for this purpose, andwhich does away with thedisadvantages noted above,is the sfraij filter or air-washer, one form of whichis shown in. Fii;. 172. Airenters as indicated, andfirst passes through a tem-pering coil to raise it…
Architecture · Building · Carpentry
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