What is the function of a draft hood in combustion appliances?

The function of a draft hood in combustion appliances is to maintain a proper draft. A draft hood is designed to ensure that there is an adequate flow of combustion gases away from the appliance while preventing combustion products from escaping into the living space. It helps facilitate the proper balance of air and gas during the combustion process, which is critical for achieving efficient and safe operation of heating appliances.

By providing a pathway for exhaust gases to exit safely, the draft hood also helps to protect against backdrafting, which can occur if there is a negative pressure in the venting system. This is important for maintaining the overall performance and safety of gas-fired systems. The draft hood also aids in accommodating changes in the combustion appliance's operation, ensuring consistent airflow as needed.