What is the required combustion air opening size for appliances in a structure with an equivalent leakage area greater than 0.05 square meters, given specific input BTUs?

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Multiple Choice

What is the required combustion air opening size for appliances in a structure with an equivalent leakage area greater than 0.05 square meters, given specific input BTUs?

When sizing combustion air, you look at the total input BTU/h of the appliances and the structure’s equivalent leakage area (ELA). If the ELA is greater than 0.05 m^2, the code sets a minimum free area for each outdoor combustion air opening to ensure there’s enough air for the appliances. For the given BTU input, the minimum required opening size is nine square inches. That means each outdoor opening should have at least 9 in^2 of free area (the two openings together provide the air), and you could use larger openings, but nine square inches is the smallest compliant size.

When sizing combustion air, you look at the total input BTU/h of the appliances and the structure’s equivalent leakage area (ELA). If the ELA is greater than 0.05 m^2, the code sets a minimum free area for each outdoor combustion air opening to ensure there’s enough air for the appliances. For the given BTU input, the minimum required opening size is nine square inches. That means each outdoor opening should have at least 9 in^2 of free area (the two openings together provide the air), and you could use larger openings, but nine square inches is the smallest compliant size.

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