Final answer:
A confined space should have a volume less than a certain value in cubic feet per 1,000 Btu/h of the aggregate input rating of all appliances installed in that space.
Step-by-step explanation:
In order to determine the volume of a confined space, we need to calculate the volume of space required per unit of energy input. The formula states that a confined space should have a volume less than a certain value in cubic feet per 1,000 Btu/h of the aggregate input rating of all appliances installed in that space. The specific value can be calculated using the given conversion factors and energy densities.