When connecting both gas and oil appliances to the same chimney, what is required?

In the context of connecting both gas and oil appliances to the same chimney, it is essential to ensure that there is sufficient draft and that appropriate primary safety controls are in place. This is crucial because gas and oil appliances have different combustion characteristics and venting requirements, which affect how flue gases are expelled.

Sufficient draft ensures that the chimney can adequately remove flue gases from both types of appliances without issue, preventing backdrafts or the potential for harmful gases to enter the living space. Additionally, primary safety controls help monitor the operation of each appliance, ensuring that they function safely and efficiently, and they can prevent dangerous scenarios such as flue gas spillage or furnace malfunction.

The other options do not adequately address the need for safe and effective venting of both appliance types. Therefore, ensuring sufficient draft and implementing primary safety controls are vital for maintaining safe operation while connecting both gas and oil appliances to a single chimney.