How much volume is required per 1,000 BTU for a building self-vented system?

The correct amount of volume required per 1,000 BTUs for a building self-vented system is 50 cubic feet. This requirement is based on the need for adequate air supply for combustion in gas appliances. In self-vented systems, adequate volume is essential to ensure that there is enough air for the fuel to burn efficiently, and it helps to maintain a safe environment within the building.

When calculating the volume requirements, it's crucial to consider the BTU input of the appliance and the surrounding space. Without sufficient volume, the system may not operate properly, which could lead to ventilation issues, improper combustion, and increased risks of carbon monoxide buildup.

Other options suggest varying cubic feet amounts, which would not provide the necessary air volume for effective combustion and ventilation, making them insufficient for a self-vented system. Therefore, 50 cubic feet is the recognized standard that ensures that gas appliances operate safely and effectively within residential buildings.