The burning of gas, oil, coal, or other combustible material requires airhen the end result of the burning is to be an efficient combustion process, in compliance with Federal and State Clean Air Act requirements, the volume of supply air must be reliably controllednsufficient air volume will result in wasted fuel and excessive particulate along with potentially explosive gases in the exhaust systemoo much air increases the amount of heat carried up the stack by the excess draftither extreme increases the cost and difficulty of controlling exhaust emissionsir can be supplied to the combustion process by natural or mechanical draftatural draft simply refers to the use of a chimney or stack to induce an upward flow of airhe stack effect pulls air into the combustion chamber, as shown in Figure 1he amount of airflow depends on the stack's height and diameter, the prevailing wind velocity, and the resistance of the burner mechanism or fuel bed itselfhe need for ... [Read More - What Can Students Do To Save The Environment]

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