A treatise on architecture and building construction (1899)
International Correspondence Schools · Scranton, The Colliery engineer co. · leaf 344
planking, is a verybad one, and should not be permitted, unless the bottom ofthe trench is made water-tight. The worst arrangement,however, is a similar duct having wooden sides and top. 17 OF BUILDINGS. 147 The wood slowly rots and the ground air freely enters theduct. 334. Underground ducts… … cold-air duct made in this way, with openings at oppositesides of the building. Two methods are shown of arrangingthe inlets and dampers. At a, the shutter, or damper, ishinged at one edge to the window frame; and at b^ an ordi-nary butterfly damper is employed. These dampers may beoperated from…
Architecture · Building
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