Sweet’s indexed catalogue of building construction for the year 1906 (1906)
New York : Chicago : Architectural Record · leaf 586
a sanitary point ofview, and, aside fromthis, in fine residences itis a great protection tohangings and paintingswhich so readily collectthe dust and dirt con-veyed to the roomsthrough the cold air sup-ply inlets of heating sys-tems. The advantages ofthe Whitley Air Filter-ing system over all… … [Patented] FILTER SECTION OF WHITLEY AIR FILTERING SYSTEM This system is especially advantageous where cellar room is limited. This consists of a steel plate frame, in which is placed a damper that can read-ily be removed for cleaning the chimneys. It is designed especially for my own usein…
Building materials
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