What type of spaces should be considered as communicating for indoor combustion air?

Communicating spaces are defined as areas that provide a direct air pathway between the inside of a building and the outside or between different rooms within the structure. These spaces allow air to flow freely, enabling indoor combustion appliances to draw sufficient air for proper combustion. By ensuring that there is a connection to these spaces, it is easier to meet the air requirements for combustion without relying solely on specific ventilation.

In contrast, non-ventilated spaces do not provide an adequate air supply and may lead to insufficient oxygen levels for combustion, while open spaces often refer to general areas without partitions, which may or may not effectively communicate with the outdoor environment. Separated spaces imply confined areas that do not allow for proper airflow and are, therefore, not suitable as a reliable source of combustion air. Consequently, identifying communicating spaces is critical for ensuring safety and efficiency in combustion appliance operation.