Gas Fitter Practice Test

What size should an air grill be for a room containing certain gas appliances?

1. 120 square inches

2. 240 square inches

3. 250 square inches

4. 1080 square inches

The correct answer is: 250 square inches

To determine the appropriate size for an air grill in a room containing gas appliances, a key consideration is ensuring adequate combustion air supply. Gas appliances need a sufficient amount of air to operate efficiently and safely, as insufficient air can lead to improper combustion and potential hazards like carbon monoxide buildup. The correct answer of 250 square inches reflects the general guidelines that dictate the minimum required area for combustion air openings based on the appliance types present and the volume of the room. This measurement is typically established by various building codes and standards that focus on safety and efficiency in gas appliance operation. In practice, factors such as the BTU input of the appliances, room size, and the configuration of the air supply openings play critical roles in this determination. Thus, the size of 250 square inches strikes a balance between sufficient airflow and safety for the gas appliances being utilized in the room.