G2 Gas Fitter Practice Exam

Where must the air supply for heating appliances with less than 400,000 Btu/h come from?

1. Directly from outside

2. Clause 8.2 and 8.3 of the B149.1 gas code

3. Indoor air only

4. Ventilation system

The correct answer is: Clause 8.2 and 8.3 of the B149.1 gas code

The correct answer refers to specific guidelines outlined in the B149.1 gas code, which provides detailed requirements for the safe installation and operation of gas appliances. For heating appliances with an input capacity of less than 400,000 Btu/h, the code stipulates that the air supply should comply with certain clauses that ensure the appliances operate efficiently and safely. Clause 8.2 and 8.3 address the necessary ventilation and air supply considerations essential for the combustion process of gas-fueled heating appliances, emphasizing the importance of having adequate and appropriate air supply to prevent issues such as backdrafting or insufficient combustion air. This adherence to established safety standards is crucial for maintaining air quality and proper functioning of the appliance. The other options lack the specificity and regulatory context necessary for this question. While some could be premises for air supply, they do not reference the mandated guidelines that govern the installation of gas appliances as effectively as the gas code does. This distinction emphasizes the importance of understanding applicable codes and standards in the gas fitting profession.