File:Catalog 13- Carrier air washers and humidifiers- applied to public office and industrial buildings, with notes on humidity (1913) (14778666752).jpg

Identifier: Catalog13CarrierAirWashersAndHumidifiersAppliedToPublicOfficeAnd (find matches)
Title: Catalog 13: Carrier air washers and humidifiers: applied to public office and industrial buildings, with notes on humidity
Year: 1913 (1910s)
Authors: Carrier Air Conditioning Company of America
Subjects: air purification -- catalogs humidity control equipment and supplies -- catalogs Division 23 HVAC air-cleaning devices particulate air-filtration humidity control equipment humidifiers
Publisher: Carrier Air Conditioning Company of America
Contributing Library: MBJ collection

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5 to 5.5 grains per cu.ft, while at o degrees it contains only about 0.3 grains andat 32 degrees about 1.25 grains, so that in the usual systemsof heating, with 32 degrees outside, the humidity of the airwhen heated to 70 degrees would be only 15.5 percent, orabout one-half the humidity of the dryest climate known. It is this extreme dryness of the air in a heated room whichproduces many of the discomforts commonly noticed, but notfully explained, such as extreme thirst, a parched feeling in thenose and throat, lassitude and headache. The effect of thisextreme dryness is undoubtedly very harmful to the mucousmembrane in nose, throat and the lungs, and may be considereda contributing source of many throat and pulmonary diseases. Ordinary Rooms Dryer Than a Desert: ,_ . _ Per Cent. Per Cent. Humidity Outdoor Temperature Humidity of same air when Degrees (assumed) heated to 700 0 50 3 80 5 15 50 6% 80 10 30 SO I2>4 80 igy2 45 50 21% 80 34 71 Carrier Air Conditioning Company of America
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o m 3 < I—I M £ < y Pl, a s Sow W 72 Carrier Air Conditioning Company of America When heating to the ordinary room temperature of 70 degrees,the relative humidities will he only 5 percent and 20 percentrespectively, with corresponding moisture deficits of 3 grainsto 4 grains per cu. ft. This creates an artificial climate, dryerthan that of any desert. Hygienic Effects: From a hygienic standpoint, therelative humidity affects the mucous membrane of the nose,throat and lungs. Dry air readily absorbs moisture fromthe skin, drying and cracking the delicate tissue, and frequentlycausing throat irritation and consequent coughing. The in-jurious effect on the mucous membrane is especially aggravatedby a wide indoor variation in humidity. In fact, the theoryhas been advanced that a copious supply of fresh air at aconstant temperature and a fixed humidity in a sanitarium,would do much for the cure of lung, throat and nasal diseases,as much, for instance, as the comparatively fixed wea

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