Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 267
nstructfalse ceilings in the corridor-ways on each floor, thus forming air-ducts which may receive their supply through one or more large up-takes extending from the basement to the top of the building. Ihesecorridor air-ways may be tapped over the door of each room, theopenings being provided with… … S^^i a .•.■,.( <
Architecture · Building · Carpentry
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