What is true about the spillage period for all combustion appliances?

The spillage period refers to the time it takes for combustion appliances to expel combustion gases or flue products effectively. An acceptable spillage period of one minute or less is significant because it indicates that the appliance is operating correctly and efficiently, ensuring that harmful gases are not entering the living space.

When the spillage period exceeds this acceptable threshold, it may signal issues with venting or a malfunction, potentially leading to unsafe conditions. Having a standard of one minute helps maintain safety protocols by ensuring that any potential spillage is addressed promptly and does not linger in the environment.

In contrast, while the spillage period can be measured in seconds and may vary depending on the appliance type, the emphasis on a one minute or less standard serves as a general guideline for safety and performance across all combustion appliances. Thus, this option captures essential safety considerations relevant to the operation of combustion appliances.