The hot blast system of heating and ventilating . n Charge of Major Work ead of Department Committee on Final Examination 1448B0 -1- HOT BLAST HEATI1?G & VETJTILATI05T. Introduction, Air, being the prime supporter of life, health is dependent|jon the composition of the atmosphere. Although a simple mech-anical mixture, yet certain gases of which it is composed, existin almost unalteralDle proportion in a normal atmosphere. Oxyg;en\^and nitrogen, the principal constituents, are present in verynearly the proportion of 1 part of oxygen to 4 parts of acid gas, the result of all p
The hot blast system of heating and ventilating . n Charge of Major Work ead of Department Committee on Final Examination 1448B0 -1- HOT BLAST HEATI1?G & VETJTILATI05T. Introduction, Air, being the prime supporter of life, health is dependent|jon the composition of the atmosphere. Although a simple mech-anical mixture, yet certain gases of which it is composed, existin almost unalteralDle proportion in a normal atmosphere. Oxyg;en\^and nitrogen, the principal constituents, are present in verynearly the proportion of 1 part of oxygen to 4 parts of acid gas, the result of all perfect comhustion, eitherslov/ or rapid, exists in the very small proportion of 3 to 4parts in 10000 of pure air. li The following table gives the composition of pure air andof respired air: Pure Air. Respired Air. Oxygen j Mtrogen 75,4 Carbon Dioxide to Water Vapor (variable) 5. Carbonic acid gas, unless present in rery large quantities,is not in itself either harmful or disagreeable, but the amountpresenthotblastsystemof00wein
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