For every one cubic foot of natural gas used on a gas-fired appliance, how much combustion air is required?

For every one cubic foot of natural gas combusted in a gas-fired appliance, the requirement for combustion air is approximately 10 cubic feet. This is based on the principle that adequate air supply is crucial for complete combustion, which ensures efficient burning of the gas, optimal appliance performance, and the reduction of harmful emissions.

Choosing 15 cubic feet may seem plausible at first, as it suggests a safety margin for airflow, but the standard requirement is 10 cubic feet per cubic foot of natural gas. This ratio accounts for the stoichiometric requirements of the combustion process, emphasizing that more air than gas can lead to inefficient operation or increased emissions. It's essential to refer to specific manufacturer guidelines or industry standards for precise requirements to avoid operational issues in heating systems.

Therefore, while the requirement might vary based on specific appliances and circumstances, the widely accepted figure for natural gas combustion air needs aligns with the lesser ratio, confirming that 10 cubic feet of air for each cubic foot of gas is the established metric.