A conventional gas-fired domestic hot water heater is designed to have adequate combustion air. Where should the combustion air intake typically be located to prevent potential issues with appliance operation and safety?

Question: A conventional gas-fired domestic hot water heater is designed to have adequate combustion air. Where should the combustion air intake typically be located to prevent potential issues with appliance operation and safety?

Answer options: ✅ From an area with ample, unobstructed air flow, typically low to the ground to draw colder, denser air.

• From the immediate vicinity of the appliance, near the ceiling to capture warm, rising air.
• From another room via a small duct to minimize heat loss.
• From a sealed attic space to prevent dust ingress.

Correct answer: From an area with ample, unobstructed air flow, typically low to the ground to draw colder, denser air.

Explanation: Combustion air for conventional gas-fired appliances should be drawn from an area that ensures a continuous, ample supply, and is typically taken from low to the ground. This provides denser, colder air for more efficient combustion. Drawing air from near the ceiling or from another room via a small duct could restrict airflow. Attic spaces are not typically sealed or appropriate for combustion air. Refer to CSA B149.1 for specific requirements.