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Combustion air calculation worksheet 2025

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The document is a calculation worksheet for determining the required combustion air in a room based on the volume of the room and the input ratings of appliances. It outlines steps to calculate room volume, total appliance input, and whether additional air is needed for safe combustion. Two methods are provided: a standard method and an alternate method, both requiring input from various appliances. The document includes a table for recording appliance ratings and concludes with a section for indicating if additional air is necessary.

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How much combustion air is required for a 100,000 BTU burner?

How Much Air is Enough? With a 10:1 ratio, it takes at least 1,000 cubic feet of air to burn every 100,000 BTUs (1 CCF) that goes through a furnace. Because combustion is far from perfect in residential equipment, the requirement is more likely to be 1,500 2,000 cubic feet of air.

How many cfm do I need for combustion air?

Where all combustion air and dilution air is provided by a mechanical forced-air system, the combustion air and dilution air shall be supplied at the minimum rate of 1 cfm per 2,400 Btu/h [0.00067 m3/(s kW)] of combined input rating of all the fuel-burning appliances served.

How to calculate excess air in combustion?

1:39 8:19 First we know that air is primarily nitrogen which does not react.MoreFirst we know that air is primarily nitrogen which does not react.

How to calculate for combustion air?

There are two ways to determine the amount of indoor combustion air required from indoors. One is the Standard Method (G2407. 5.1) (304.5. 1) calculated by a ratio of 50 cubic feet per 1,000 Btu/h (4.8 m3/Kw) of the appliance input rating.

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