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1947 - this room's new lighting and air-conditioning materially reduce the strain of their work

FLOURESCENT TROFFER UNITS REDUCE STRAIN

CD 1963095 E&MP 25.034

Electric Lamps

April 2, 1947

More than one hundred and fifty designing engineers in this recently enlarged Cleveland District drafting room, adjacent to The Austin Company's General Offices, have found that the room's new lighting and air-conditioning materially reduce the strain of their work.

Recessed, fluorescent troffer units on 3-ft. centers, extending the length of the room between the welded rigid frame arches, have each been quipped with one daylight and one soft-white tube of 40 watt intensity. With mounting heights which range from 13-ft. near the outsides of the 70-ft. span to 22-ft. at the peak, a uniform, well-balanced lighting intensity of over 90-ft. candles is maintained on the drafting tables. The troffer units have been suspended from the purlins, and the metal acoustic ceiling is supported by these lighting fixtures.

Three lines of air-conditioning supply ducts are located on each side of the room toward the outside of the span. These extend the length of the building, and are supported on the rigid frame arches, being located between the purlins. A space between the four lines of purlins in the high center section serves as a return air duct.

Air-conditioning machinery, housed in a small two-story equipment building adjoining the drafting room, includes a fan room designed to handle 35,00 cfm. A new type of electrostatic filter, which applies an electrical charge of between 6,000 and 9,000 volts to filter paper, has been installed on the second floor across the entrance to the plenum chamber. Reciprocating refrigerating compressors of 100-ton total capacity have been installed on the first floor, with evaporative condensers and other auxiliary equipment. Steam for heating is supplied by the existing boiler plant.

Lower wall areas have been painted in graduated shades of soft gray-blue, with a neutral "Caen Stone shade in the upper walls.


Original Caption by Science Service



National Museum of American History

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