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Manufacturer: National Mercantile Company, 80 West Washington Street, Chicago.
The National Air Unit is designed to remove pollen, dust and other solid particles from the incoming air for relief of diseases resulting from the inhalation of such particles. It is enclosed in a metal rectangular box 16 inches wide by 10 inches high by 7 ½ inches deep with intake projection, and the whole is fitted under the ordinary window sash. There are four sets of fixed louvers on the front of the unit. A shutter may be fitted into the intake to permit rec[ill]ulation of the room air. Rubber weather stripping is provided. The motor is of the induction type for 110 volts alternating current, consuming approximately 45 watts per hour. A Universal motor is available for direct current. The shipping weight is approximately 25 pounds.
The unit is equipped with a four bladed fan which draws the air
NATIONAL AIR UNIT NOT ACCEPTABLE. JAMA. 1939;112(18):1829–1830. doi:10.1001/jama.1939.62800180011015a
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