National Geographic : 1918 May
I I i smoke, as well as intake of pure air which health and efficiency demand. Coo airthru the side ventilators relaces fumes and Gases which rise steadily to the monitor SThe upper vents of Fenestra Solid Steel eits of this fondry Windows, opening ninety degrees, provide an irresistible outlet for j j smoke and gases while the lower vents pour fresh air into the build ing. And with this, FenestraWindows afford perfected fire protection besides permitting daylight to flood every inch of floor space. Get the full facts by addressing | .Detroit Steel Products Company SFenestra Operators are designed and built as a part of Fenestra Sash. Descriptive catalog on request "Mention the Geographic-It identifies you."