A commercial building's chimney must be what size if it serves one Category 1 natural draft vented appliance with a 341,000 Btu input?

For a chimney serving a Category 1 natural draft vented appliance, the sizing is crucial to ensure proper venting of combustion gases. The total input capacity of the appliance, in this case, is 341,000 BTU per hour.

When determining the chimney diameter, it's important to refer to the relevant standards, such as those outlined in the National Fuel Gas Code (NFPA 54) or the manufacturer's instructions. The sizing process typically involves calculating the required cross-sectional area based on the input rating of the appliance.

For natural draft appliances, which generally vent products of combustion through a vertical stack, the chimney size must provide adequate draft while accommodating the volume of flue gases produced. In this scenario, the input BTU rating correlates to the vent size; as the BTU input increases, so does the necessary chimney diameter to maintain efficiency and function.

For a 341,000 BTU appliance, standard sizing charts indicate that an 8-inch diameter chimney is generally adequate to handle the venting requirements. This size helps to ensure that the appliance operates efficiently and that there is sufficient draft to safely carry combustion gases outside the building.

In summary, the appropriate chimney size for a Category 1 appliance with a 341,000