The most desirable atmospheric conditions are obtained at a temperature of 68° F. to 70° F., with the relative humidity from 40% to 60%. This is given only as a general average and will necessarily vary with many conditions, such as seasons of the year and occupation.
Moderately cool and relatively dry air increases the activities of the body, makes breathing easy and more frequent, and hence increases the circulation of the blood. Innate is thus enabled, in such an atmosphere, to bring about more perfect metabolism.
Proper temperature and humidity of the air in houses, impurities found therein, source of impurities and their effect upon health, will all be considered thoroughly under Hygienic Housing.
CHAPTER IV
VENTILATION
VENTILATION
Introduction
VENTILATION DEFINED
RATE OF RESPIRATION
VOLUME OF AIR INSPIRED AND EXPIRED
CAPACITY OF THE LUNGS
AMOUNT OF AIR REQUIRED PER HOUR
OBJECT OF VENTILATION
Sources of Impurities in Air
RESPIRATION OF PERSONS
IMPURITIES FROM HEATING AND ILLUMINATION
ACCIDENTAL SOURCES
EFFECTS OF FOUL AIR
Requirements of a Ventilating System
EXCHANGE AND CIRCULATION OF AIR
ILL EFFECTS OF VITIATED AIR
REBREATHING AIR
NATURE’S PURIFICATION METHODS
NECESSITY FOR VENTILATION
Natural Means of Ventilation
THROUGH WINDOWS AND DOORS
AMOUNT OF CUBIC SPACE PER PERSON
THROUGH SPECIAL DUCTS
Mechanical Ventilation
DEVICES REQUIRED
PLENUM SYSTEM
VACUUM SYSTEM
Washing the Air Before Admitting to House
CHAPTER IV
VENTILATION
Introduction
Ventilation as defined by Webster is, “To cause fresh air to circulate; to cause inside resident impure air to be removed and replaced with fresh, pure air, whether it be in building, streets, mines, or sewers.”