![]() To an un-confined space through leaks in the building.Ģ. Combustion air is supplied to the combustion appliance in four ways.ġ. A confined space is a CAZ with less than the NFPA-required amount of volume.Ī confined space is defined by NFPA 54 as a room containing one or more combustion appliances that has less than 50 cubic feet of volume for every 1000 BTUH of appliance input.įor confined spaces, the NFPA 54 requires additional combustion air from outside the CAZ. ![]() An un-confined space is a CAZ having the NFPA-required amount of room volume that is assumed to provide enough combustion air. ![]() SWS Detail: 2.0203.1 Combustion Air for Natural Draft AppliancesĪ combustion appliance zone (CAZ) is classified as either an un-confined space or confined space.
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