What is the role of draft air in a mechanical exhaust system?

The role of draft air in a mechanical exhaust system is to mix with flue gases in draft hoods. This process is crucial as it helps in maintaining proper combustion efficiency and ensuring the safe disposal of exhaust gases. When draft air is introduced into the system, it creates a balanced airflow that helps to draw the flue gases out of the appliance, preventing backdrafts and ensuring that the gases are expelled safely. This mixing process also contributes to the proper functioning of combustion appliances by supporting the necessary airflow for combustion and preventing the buildup of harmful gases within the system.

In the context of mechanical systems, draft air allows for the ventilation of gases that could otherwise be hazardous if allowed to accumulate. It plays an integral role in achieving efficient and safe operation of heating systems and contributes to the overall performance of mechanical exhaust systems.